Portal:Birds
The Birds Portal
Birds are a group of warm-blooded vertebrates constituting the class Aves (Latin: [ˈaːwεs]), characterised by feathers, toothless beaked jaws, the laying of hard-shelled eggs, a high metabolic rate, a four-chambered heart, and a strong yet lightweight skeleton. Birds live worldwide and range in size from the 5.5 cm (2.2 in) bee hummingbird to the 2.8 m (9 ft 2 in) common ostrich. There are over 11,000 living species and they are split into 44 orders. More than half are passerine or "perching" birds. Birds have wings whose development varies according to species; the only known groups without wings are the extinct moa and elephant birds. Wings, which are modified forelimbs, gave birds the ability to fly, although further evolution has led to the loss of flight in some birds, including ratites, penguins, and diverse endemic island species. The digestive and respiratory systems of birds are also uniquely adapted for flight. Some bird species of aquatic environments, particularly seabirds and some waterbirds, have further evolved for swimming. The study of birds is called ornithology.
Birds are feathered theropod dinosaurs and constitute the only known living dinosaurs. Likewise, birds are considered reptiles in the modern cladistic sense of the term, and their closest living relatives are the crocodilians. Birds are descendants of the primitive avialans (whose members include Archaeopteryx) which first appeared during the Late Jurassic. According to some estimates, modern birds (Neornithes) evolved in the Late Cretaceous or between the Early and Late Cretaceous (100 Ma) and diversified dramatically around the time of the Cretaceous–Paleogene extinction event 66 million years ago, which killed off the pterosaurs and all non-ornithuran dinosaurs.
Many social species preserve knowledge across generations (culture). Birds are social, communicating with visual signals, calls, and songs, and participating in such behaviour as cooperative breeding and hunting, flocking, and mobbing of predators. The vast majority of bird species are socially (but not necessarily sexually) monogamous, usually for one breeding season at a time, sometimes for years, and rarely for life. Other species have breeding systems that are polygynous (one male with many females) or, rarely, polyandrous (one female with many males). Birds produce offspring by laying eggs which are fertilised through sexual reproduction. They are usually laid in a nest and incubated by the parents. Most birds have an extended period of parental care after hatching.
Many species of birds are economically important as food for human consumption and raw material in manufacturing, with domesticated and undomesticated birds being important sources of eggs, meat, and feathers. Songbirds, parrots, and other species are popular as pets. Guano (bird excrement) is harvested for use as a fertiliser. Birds figure throughout human culture. About 120 to 130 species have become extinct due to human activity since the 17th century, and hundreds more before then. Human activity threatens about 1,200 bird species with extinction, though efforts are underway to protect them. Recreational birdwatching is an important part of the ecotourism industry. (Full article...)
Featured articles
The elfin woods warbler (Setophaga angelae) is a species of bird endemic to Puerto Rico, where it is local and uncommon. Discovered in 1968 and described in 1972, it is the most recently described New World warbler (family Parulidae).
The species name, angelae, is a tribute to Angela Kepler, one of its discoverers. These birds are insectivores, as they feed by gleaning small insects off the habitat leaves.
Due to its small populations and restricted habitats, conservation efforts were begun in 1982 to protect this species, but as of 2005, the warbler was still in need of protection. The species is not in immediate danger as the majority of its habitat is protected forest, but introduced species (such as rats and small Asian mongooses), habitat reduction, and natural disasters represent potential threats to the population. (Full article...)
Ham Wall is an English wetland National Nature Reserve (NNR) 4 kilometres (2.5 mi) west of Glastonbury on the Somerset Levels. It is managed by the Royal Society for the Protection of Birds (RSPB). Since the last Ice Age, decomposing plants in the marshes of the Brue valley in Somerset have accumulated as deep layers of peat that were commercially exploited on a large scale in the twentieth century. Consumer demand eventually declined, and in 1994 the landowners, Fisons, gave their old workings to what is now Natural England, who passed the management of the 260 hectares (640 acres) Ham Wall section to the RSPB.
The Ham Wall reserve was constructed originally to provide reed bed habitat for the Eurasian bittern, which at the time was at a very low population level in the UK. The site is divided into several sections with independently controllable water levels, and machinery and cattle are used to maintain the quality of the reed beds. There are important breeding populations of wetland birds including the rare little bittern and great white egret, and the area hosts several other uncommon animals and plants. The RSPB works with other organisations as part of the Avalon Marshes Partnership to coordinate conservation issues across the Somerset Levels.
The reserve is open year-round, and has nature trails, hides and viewing points. It lies within the Somerset Levels NNR and the Somerset Levels and Moors' Ramsar and Special Area of Conservation site. Potential future threats may result from increasing unpredictability in the UK climate, leading to heavy summer rains and extensive flooding. Sea level rise will make the drainage of the Levels more difficult, and current water pumping facilities may become inadequate. (Full article...)
The wood stork (Mycteria americana) is a large wading bird in the family Ciconiidae (storks). Originally described in 1758 by Carl Linnaeus, this stork is native to the subtropics and tropics of the Americas where it persists in habitats with fluctuating water levels. It is the only stork species that breeds in North America. The head and neck are bare of feathers, and dark grey in colour. The plumage is mostly white, with the exception of the tail and some of the wing feathers, which are black with a greenish-purplish sheen.
Globally, the wood stork is considered to be of least concern by the International Union for Conservation of Nature. In the United States, the wood stork was previously classified as Endangered due to loss of suitable feeding habitat in the Florida Everglades, its historical population stronghold in the country. The species has been subsequently downlisted to Threatened after northward range expansion and increased population size. (Full article...)
The Mauritius sheldgoose (Alopochen mauritiana), also known as the Mauritius shelduck, is an extinct species of sheldgoose that was endemic to the island of Mauritius. While geese were mentioned by visitors to Mauritius in the 17th century, few details were provided by these accounts. In 1893, a carpometacarpus wing-bone and a pelvis from the Mare aux Songes swamp were used to name a new species of comb duck, Sarcidiornis mauritianus. These bones were connected to the contemporary accounts of geese and later determined to belong to a species related to the Egyptian goose and placed in the sheldgoose genus Alopochen. The Mauritius and Réunion sheldgoose may have descended from Egyptian geese that colonised the Mascarene Islands.
One contemporary account states that the Mauritius sheldgoose had wings that were half black and half white, and that the bird was not very large. The species may also be depicted in one illustration. Fossil elements show that it was smaller than the Egyptian goose, but with more robust legs. Little is known about the habits of the Mauritius sheldgoose, accounts indicate they were very tame, were grazers, lived in groups, and usually stayed on the north side of the island except for during the dry season when they were forced to the other side to drink. Their robust legs indicate they were becoming more terrestrial, which is supported by accounts stating they avoided water. The species was considered highly palatable by travellers, and while abundant in 1681, it declined quickly thereafter, being declared extinct in 1698. It was probably driven to extinction due to overhunting and predation by introduced animals, particularly cats. (Full article...)
Holkham National Nature Reserve is England's largest national nature reserve (NNR). It is on the Norfolk coast between Burnham Overy Staithe and Blakeney, and is managed by Natural England with the cooperation of the Holkham Estate. Its 3,900 hectares (9,600 acres) comprise a wide range of habitats, including grazing marsh, woodland, salt marsh, sand dunes and foreshore. The reserve is part of the North Norfolk Coast Site of Special Scientific Interest, and the larger area is additionally protected through Natura 2000, Special Protection Area (SPA) and Ramsar listings, and is part of both an Area of Outstanding Natural Beauty (AONB) and a World Biosphere Reserve. Holkham NNR is important for its wintering wildfowl, especially pink-footed geese, Eurasian wigeon and brant geese, but it also has breeding waders, and attracts many migrating birds in autumn. Many scarce invertebrates and plants can be found in the dunes, and the reserve is one of the only two sites in the UK to have an antlion colony.
This stretch of coast originally consisted of salt marshes protected from the sea by ridges of shingle and sand, and Holkham's Iron Age fort stood at the end of a sandy spit surrounded by the tidal wetland. The Vikings navigated the creeks to establish Holkham village, but access to the former harbour was stopped by drainage and reclamation of the marshes between the coast and the shingle ridge which started in the 17th century, and was completed in 1859. The Holkham estate has been owned by the Coke family, later Earls of Leicester since 1609, and their seat at Holkham Hall is opposite the reserve's Lady Anne's Drive entrance. The 3rd Earl planted pines on the dunes to protect the pastures reclaimed by his predecessors from wind-blown sand. The national nature reserve was created in 1967 from 1,700 hectares (4,200 acres) of the Holkham Estate and 2,200 hectares (5,400 acres) of foreshore belonging to the Crown.
The reserve has over 100,000 visitors a year, including birdwatchers and horse riders, and is therefore significant for the local economy. The NNR has taken steps to control entry to the fragile dunes and other areas important for their animals or plants because of the damage to sensitive habitats that could be caused by unrestricted access. The dunes are an essential natural defence against the projected rises in sea level along this vulnerable coast. (Full article...)
The black honeyeater (Sugomel nigrum) is a species of bird in the honeyeater family Meliphagidae. The black honeyeater exhibits sexual dimorphism, with the male being black and white while the female is a speckled grey-brown; immature birds look like the female. The species is endemic to Australia, and ranges widely across the arid areas of the continent, through open woodland and shrubland, particularly in areas where the emu bush and related species occur.
A nectar feeder, the black honeyeater has a long curved bill to reach the base of tubular flowers such as those of the emu bush. It also takes insects in the air, and regularly eats ash left behind at campfires. Cup-shaped nests are built in the forks of small trees or shrubs. The male engages in a soaring song flight in the mating season, but contributes little to nest-building or incubating the clutch of two or three eggs. Both sexes feed and care for the young. While the population appears to be decreasing, the black honeyeater is sufficiently numerous and widespread and hence is considered to be of least concern on the International Union for Conservation of Nature (IUCN)'s Red List of Endangered species. (Full article...)
The turkey vulture (Cathartes aura) is the most widespread of the New World vultures. One of three species in the genus Cathartes of the family Cathartidae, the turkey vulture ranges from southern Canada to the southernmost tip of South America. It inhabits a variety of open and semi-open areas, including subtropical forests, shrublands, pastures, and deserts.
Like all New World vultures, it is not closely related to the Old World vultures of Europe, Africa, and Asia. However, the two groups strongly resemble each other due to convergent evolution.
The turkey vulture is a scavenger and feeds almost exclusively on carrion. It finds its food using its keen eyes and sense of smell, flying low enough to detect the gasses produced by the early stages of decay in dead animals. In flight, it uses thermals to move through the air, flapping its wings infrequently. It roosts in large community groups. Lacking a syrinx—the vocal organ of birds—its only vocalizations are grunts or low hisses. It nests in caves, hollow trees, or thickets. Each year it generally raises two chicks, which it feeds by regurgitation. It has very few natural predators. In the United States, the vulture receives legal protection under the Migratory Bird Treaty Act of 1918. (Full article...)
The Australian raven (Corvus coronoides) is a passerine corvid bird native to Australia. Measuring 46–53 centimetres (18–21 in) in length, it has an all-black plumage, beak and mouth, as well as strong, greyish-black legs and feet. The upperparts of its body are glossy, with a purple-blue, greenish sheen; its black feathers have grey bases. The Australian raven is distinguished from the Australian crow, and other related corvids, by its long chest feathers, or throat hackles, which are prominent in mature birds. Older individuals and subadults have white irises, while the younger birds' eyes display blue inner rims; hatchlings and young birds have brown, dark irises until about fifteen months of age, at which point their irises become hazel-coloured, with an inner blue rim around each pupil, this lasting until they are roughly 2.5 to 3 years of age. Nicholas Aylward Vigors and Thomas Horsfield described the Australian raven in 1827, its species name coronoides highlighting its similarity with the carrion crow (C. corone). Two subspecies are recognised, which differ slightly in their vocalisations, and are quite divergent, genetically.
The preferred habitat of the Australian raven includes open woodlands and transitional zones, in addition to cities and towns; it has adapted well to human settlements and other urban environments, and is a commonly sighted bird in several major cities, including Sydney, Canberra, Perth, Adelaide and Brisbane. The Australian raven is territorial, with pairs generally bonding for life. Breeding takes place between July and September, with almost no variation across its range. The nest is a bowl-shaped structure of sticks sited high in a tree, or occasionally in a man-made structure such as a windmill or other building.
An omnivorous and opportunistic feeder, the Australian raven eats a wide variety of plant and animal material, from fruits and seeds to lizards, chicks of other bird species, and small mammals; they will also scour waste bins and disposal sites for human food waste, such as various produce, meats, seafood, eggs, etc. The ravens living in eastern Australia are often associated with sheep farms, and have been blamed for the killing of lambs; however, this is an exceedingly rare occurrence, as the ravens are likely seeking the afterbirth from ewes that may have recently given birth. Additionally, ravens aid in environmental "cleanup"—much like vultures on other continents—by helping rid the area of potentially dangerous pathogens which could deploy on carrion, stillborn farm animals (or other deceased mammals and birds), even scavenging newborn mammalian faeces. (Full article...)
The Rodrigues starling (Necropsar rodericanus) is an extinct species of starling that was endemic to the Mascarene island of Rodrigues. Its closest relatives were the Mauritius starling and the hoopoe starling from nearby islands; all three are extinct and appear to be of Southeast Asian origin. The bird was only reported by French sailor Julien Tafforet, who was marooned on the island from 1725 to 1726. Tafforet observed it on the offshore islet of Île Gombrani. Subfossil remains found on the mainland were described in 1879, and were suggested to belong to the bird mentioned by Tafforet. There was much confusion about the bird and its taxonomic relations throughout the 20th century.
The Rodrigues starling was 25–30 centimetres (10–12 inches) long, and had a stout beak. It was described as having a white body, partially black wings and tail, and a yellow bill and legs. Little is known about its behaviour. Its diet included eggs and dead tortoises, which it processed with its strong bill. Predation by rats introduced to the area was probably responsible for the bird's extinction some time in the 18th century. It first became extinct on mainland Rodrigues, then on Île Gombrani, its last refuge. (Full article...)
The Fiji parrotfinch (Erythrura pealii) is a species of estrildid finch endemic to Fiji that was formerly considered to be a subspecies of the red-headed parrotfinch. This parrotfinch is a small, mainly green bird with a red head and tail and a stubby dark grey bill. It is found in both forested and open habitats, and has adapted well to man-made environments such as grasslands, pasture and gardens. Pairs have a courtship display in which they fly above the trees in an undulating flight, calling constantly. Breeding birds build a domed grass nest with a side entrance, and lay a clutch normally of four white eggs. Newly hatched chicks are naked and pink, with blue balls at the upper and lower corners of the gape, and black markings inside the mouth; older fledglings resemble the adults, but lack the red head colouring. The Fiji parrotfinch eats seeds, especially of grasses, and also readily feeds on insects and nectar. It forms small flocks of up to six birds after the breeding season.
Parrotfinches may be preyed upon by indigenous birds of prey such as the endemic Fiji goshawk, or by introduced mammals such as the small Asian mongoose, rats, and mice, and they may be susceptible to disease. The Fiji species, despite being both uncommon and endemic to one island group, appears to be stable in numbers. It is therefore classified as Least Concern on the IUCN Red List, and it is protected under Fijian law. (Full article...)
The black vulture (Coragyps atratus), also known as the American black vulture, Mexican vulture, zopilote, urubu, or gallinazo, is a bird in the New World vulture family whose range extends from the southeastern United States to Peru, Central Chile and Uruguay in South America. Although a common and widespread species, it has a somewhat more restricted distribution than its compatriot, the turkey vulture, which breeds well into Canada and all the way south to Tierra del Fuego. It is the only extant member of the genus Coragyps, which is in the family Cathartidae. Despite the similar name and appearance, this species is not closely related to the Eurasian black vulture, an Old World vulture, of the family Accipitridae (which includes raptors like the eagles, hawks, kites, and harriers). For ease of locating animal corpses (their primary source of sustenance), black vultures tend to inhabit relatively open areas with scattered trees, such as chaparral, in addition to subtropical forested areas and parts of the Brazilian pantanal.
With a wingspan of 1.5 m (4.9 ft), the black vulture is an imposing bird, though relatively small for a vulture, let alone a raptor. It has black plumage, a featherless, grayish-black head and neck, and a short, hooked beak. These features are all evolutionary adaptations to life as a scavenger; their black plumage stays visibly cleaner than that of a lighter-colored bird, the bare head is designed for easily digging inside animal carcasses, and the hooked beak is built for stripping the bodies clean of meat. The absence of head feathers helps the birds stay clean and remain (more or less) free of animal blood and bodily fluids, which could become problematic for the vultures and attract parasites; most vultures are known to bathe after eating, provided there is a water source. This water source can be natural or man-made, such as a stream or a livestock water tank.
The black vulture is a scavenger and feeds on carrion, but will also eat eggs, small reptiles, or small newborn animals (livestock such as cattle, or deer, rodents, rabbits, etc.), albeit very rarely. They will also opportunistically prey on extremely weakened, sick, elderly, or otherwise vulnerable animals. In areas populated by humans, it also scavenges at dumpster sites and garbage dumps. It finds its meals by using its keen eyesight or following other (New World) vultures, which all possess a keen sense of smell. Lacking a syrinx—the vocal organ of birds—its only vocalizations are grunts or low hisses. It lays its eggs in caves, in cliffside rock crevasses, dead and hollow trees, or, in the absence of predators, on the bare ground, generally raising two chicks each year. The parents feed their young by regurgitation from their crop, an additional digestive organ unique to birds, used for storing excess food; their “infant formula”, of sorts, is thus called “crop milk”. In the United States, the vulture receives legal protection under the Migratory Bird Treaty Act of 1918. This vulture also appeared in Mayan codices. (Full article...)
The invisible rail, Wallace's rail, or drummer rail (Habroptila wallacii) is a large flightless rail that is endemic to the island of Halmahera in Northern Maluku, Indonesia, where it inhabits impenetrable sago swamps adjacent to forests. Its plumage is predominantly dark slate-grey, and the bare skin around its eyes, the long, thick bill, and the legs are all bright red. Its call is a low drumming sound which is accompanied by wing-beating. The difficulty of seeing this shy bird in its dense habitat means that information on its behaviour is limited.
Recorded dietary items include sago shoots and insects, and it also swallows small stones to help break up its food. It is apparently monogamous, but little else is known of its courtship behaviour. The only known nest was a shallow bowl in the top of a rotting tree stump that was lined with wood chips and dry leaves. The two young chicks were entirely covered in black down typical of precocial newly hatched rails. The estimated population of 3,500–15,000 birds and the restricted range mean that the invisible rail is classified as vulnerable by the International Union for Conservation of Nature (IUCN). Habitat loss has occurred through the harvesting of sago and conversion of the wetlands to rice cultivation, and the rail is eaten by local people. The described nest was in an area frequented by local villagers, so the rail may be more adaptable to habitat changes than had been thought. (Full article...)
The white-naped xenopsaris (/ˌwaɪt ˌneɪpt ˌziːnəpˈzɑːrɪs, -ˌzɛnəp-/; Xenopsaris albinucha), also known as the reed becard and white-naped becard, is a species of suboscine bird in the family Tityridae, the only member of the genus Xenopsaris. It is found in South America, in humid subtropical and tropical savanna climates in most of the countries east of the Andes: Venezuela, Brazil, Bolivia, Paraguay, Uruguay, and Argentina. Living in open woodland and other open forest habitats, it is mostly sedentary, though some populations may be migratory. The species, which is closely related to becards and tityras, was thought to be either a tyrant-flycatcher or cotinga, before it was placed in Tityridae.
The bird is 12.5 to 13 cm (4.9–5.1 in) in length, with whitish undersides, a black crown, and grey-brown upperparts. The sexes are similar in appearance, though the females have duller upperparts. It feeds on insects in the foliage of trees and bushes, and sometimes on the ground. Nesting occurs in a simple cup nest placed in the fork of a tree. Both parents incubate the eggs and help feed the chicks. When the chicks fledge, the parents may divide up the brood to continue helping. The species is not common and little is known about it, but it is not considered in danger of extinction, and has been classified as of least concern by the International Union for Conservation of Nature. (Full article...)
The banded broadbill (Eurylaimus javanicus) is a species of bird in the Eurylaimidae typical broadbill family found in Mainland Southeast Asia and the Greater Sunda Islands. It is sometimes split into two species, one including only the nominate subspecies, E. j. javanicus, and one including all the remaining subspecies. It inhabits a variety of forests, along with forest edge, rubber plantations and Falcataria falcata groves, mainly in lowland areas. A striking, large-bodied bird with a length of 21.5–23.0 cm (8.5–9.1 in), it is unlikely to be mistaken for another species. The broadbill is mostly purplish-red, with yellow-streaked black wings, a bright blue beak, a blackish face and greyish chin and upper breast. Females can be told apart from males by their lack of a black neckband, although these are indistinct in Bornean and Javan males. Despite its conspicuous appearance, the bird is usually hard to see due to its sluggishness and is usually only noticed when it vocalises.
The species mainly eats arthropods such as orthopterans (grasshoppers, katydids and crickets), true bugs and beetles, but has also been recorded feeding on snails, lizards, frogs and figs. On the mainland, breeding generally occurs during the dry season; populations in the Greater Sundas have a longer breeding season lasting from March to November. On Java, the broadbill is thought to breed year-round. Their large, raggedy nests are hung from trees at a height of 6–21 m (20–69 ft) over clearings or water bodies. Clutches have two or three eggs. The eggs are usually dull white with dark purple or reddish-brown flecks, but those from West Java are dirty white with dense rusty-brown to lavender-grey markings. The International Union for Conservation of Nature, which splits the banded broadbill into two species, classifies javanicus as being near-threatened and the other subspecies as being of least concern. (Full article...)
The yellow-tailed black cockatoo (Zanda funerea) is a large cockatoo native to the south-east of Australia measuring 55–65 cm (22–26 in) in length. It has a short crest on the top of its head. Its plumage is mostly brownish black and it has prominent yellow cheek patches and a yellow tail band. The body feathers are edged with yellow giving a scalloped appearance. The adult male has a black beak and pinkish-red eye-rings, and the female has a bone-coloured beak and grey eye-rings. In flight, yellow-tailed black cockatoos flap deeply and slowly, with a peculiar heavy fluid motion. Their loud, wailing calls carry for long distances. The yellow-tailed black cockatoo is found in temperate forests and forested areas across south and central eastern Queensland to southeastern South Australia, including a very small population persisting in the Eyre Peninsula. Two subspecies are recognised, although Tasmanian and southern mainland populations of the southern subspecies xanthanotus may be distinct enough from each other to bring the total to three. Birds of subspecies funereus (Queensland to eastern Victoria) have longer wings and tails and darker plumage overall, while those of xanthanotus (western Victoria, South Australia and Tasmania) have more prominent scalloping.
The subspecies whiteae is found south of Victoria to the East of South Australia and is smaller in size.
The yellow-tailed black cockatoo's diet primarily includes seeds of native and introduced plants while also feeding on wood-boring grubs. They nest in large hollows high in old growth native trees (~ greater than 200 years old), generally Eucalyptus regnans. Although they remain common throughout much of their range, fragmentation of habitat and loss of large trees suitable for nesting has caused population decline in Victoria and South Australia. Furthermore, the species may lose most of its mainland range due to climate change. In some places yellow-tailed black cockatoos appear to have partially adapted to recent human alteration of landscape and they can often be seen in parts of urban Canberra, Sydney, Adelaide and Melbourne. The species is not commonly seen in aviculture, especially outside Australia. Like most parrots, it is protected by CITES, an international agreement that makes trade, export, and import of listed wild-caught species illegal. (Full article...)
The northern rosella (Platycercus venustus), formerly known as Brown's rosella or the smutty rosella, is a species of parrot native to northern Australia, ranging from the Gulf of Carpentaria and Arnhem Land to the Kimberley. It was described by Heinrich Kuhl in 1820, and two subspecies are recognised. The species is unusually coloured for a rosella, with a dark head and neck with pale cheeks—predominantly white in the subspecies from the Northern Territory and blue in the Western Australian subspecies hillii. The northern rosella's mantle and scapulars are black with fine yellow scallops, while its back, rump and underparts are pale yellow with fine black scallops. The long tail is blue-green, and the wings are black and blue-violet. The sexes have similar plumage, while females and younger birds are generally duller with occasional spots of red.
Found in woodland and open savanna country, the northern rosella is predominantly herbivorous, consuming seeds, particularly of grasses and eucalypts, as well as flowers and berries, but it may also eat insects. Nesting takes place in tree hollows. Although uncommon, the northern rosella is rated as least concern on the International Union for Conservation of Nature (IUCN)'s Red List of Threatened Species. (Full article...)
The western house martin (Delichon urbicum), sometimes called the common house martin, northern house martin or, particularly in Europe, just house martin, is a migratory passerine bird of the swallow family which breeds in Europe, north Africa and across the Palearctic; and winters in sub-Saharan Africa and tropical Asia. It feeds on insects which are caught in flight, and it migrates to climates where flying insects are plentiful. It has a blue head and upperparts, white rump and pure white underparts, and is found in both open country and near human habitation. It is similar in appearance to the two other martin species of the genus Delichon, which are both endemic to eastern and southern Asia. It has two accepted subspecies.
Both the scientific and colloquial name of the bird are related to its use of human-made structures. It builds a closed cup nest from mud pellets under eaves or similar locations on buildings usually in colonies.
It is hunted by the Eurasian hobby (Falco subbuteo), and like other birds is affected by internal parasites and external fleas and mites. Although its large range and population mean that it is not threatened globally. (Full article...)When preening, a bird (such as this red lory) draws individual feathers through its beak, realigning and re-interlocking the barbules.
Preening is a maintenance behaviour found in birds that involves the use of the beak to position feathers, interlock feather barbules that have become separated, clean plumage, and keep ectoparasites in check. Feathers contribute significantly to a bird's insulation, waterproofing and aerodynamic flight, and so are vital to its survival. Because of this, birds spend considerable time each day maintaining their feathers, primarily through preening. Several actions make up preening behaviour. Birds fluff up and shake their feathers, which helps to "rezip" feather barbules that have become unhooked. Using their beaks, they gather preen oil from a gland at the base of their tail and distribute this oil through their feathers. They draw each contour feather through their bill, nibbling it from base to tip.
Over time, some elements of preening have evolved to have secondary functions. Ritualised preening has become a part of some courtship displays, for example. It is also a displacement activity that can occur when birds are subjected to two conflicting drives. Though primarily an individual function, preening can be a social activity involving two or more birds – a behaviour known as allopreening. In general, allopreening occurs either between two members of a mated pair or between flock members in a social species. Such behaviour may assist in effective grooming, in the recognition of individuals (mates or potential sexual partners), or in reducing or redirecting potential aggressive tendencies in social species. Most allopreening is confined to the head and neck, smaller efforts being directed towards other parts of the body.
Ingestion of pollutants or disease-causing organisms during preening can lead to problems ranging from liver and kidney damage to pneumonia and disease transmission. Injury and infection can cause overpreening in caged birds, as can confining a bird with a dominant or aggressive cage mate. (Full article...)
The white-bellied sea eagle (Icthyophaga leucogaster), also known as the white-breasted sea eagle, is a large diurnal bird of prey in the family Accipitridae. Originally described by Johann Friedrich Gmelin in 1788, it is closely related to Sanford's sea eagle of the Solomon Islands, and the two are considered a superspecies. A distinctive bird, the adult white-bellied sea eagle has a white head, breast, under-wing coverts and tail. The upper parts are grey and the black under-wing flight feathers contrast with the white coverts. The tail is short and wedge-shaped as in all Haliaeetinae species. Like many raptors, the female is larger than the male, and can measure up to 90 cm (35 in) long with a wingspan of up to 2.2 m (7.2 ft), and weigh 4.5 kg (9.9 lb). Immature birds have brown plumage, which is gradually replaced by white until the age of five or six years. The call is a loud goose-like honking.
Resident from India and Sri Lanka through Southeast Asia to Australia on coasts and major waterways, the white-bellied sea eagle breeds and hunts near water, and fish form around half of its diet. Opportunistic, it consumes carrion and a wide variety of animals. Although rated as Least Concern globally, it has declined in parts of southeast Asia such as Thailand, and southeastern Australia. It is ranked as Threatened in Victoria and Vulnerable in South Australia and Tasmania. Human disturbance to its habitat is the main threat, both from direct human activity near nests which impacts on breeding success, and from removal of suitable trees for nesting. The white-bellied sea eagle is revered by indigenous people in many parts of Australia, and is the subject of various folk tales throughout its range. (Full article...)
The kererū (Hemiphaga novaeseelandiae), also known as kūkupa (northern Māori dialects), New Zealand pigeon or wood pigeon, is a species of pigeon native to New Zealand. Johann Friedrich Gmelin described the bird in 1789 as a large, conspicuous pigeon up to 50 cm (20 in) in length and 550–850 g (19–30 oz) in weight, with a white breast and iridescent green–blue plumage. Two subspecies have been recognised; the second—the Norfolk pigeon of Norfolk Island—became extinct in the early 20th century. Kererū pairs are monogamous, breeding over successive seasons and remaining together when not breeding. They construct nests with twigs in trees, with a single egg clutch.
Found in a variety of habitats across the country, the kererū feeds mainly on fruits, as well as leaves, buds and flowers. Although widespread in both forest and urban habitats, its numbers have declined significantly since European colonisation and the arrival of invasive mammals such as rats, stoats and possums. However, the results of nationwide bird surveys indicate that there has been a significant recovery in the population in suburban areas. As of 2022, the IUCN Red List classifies the species as least concern, while the Department of Conservation (DOC) classifies the kererū as "not threatened" but conservation dependent.
Considered a taonga (cultural treasure) to the Māori people, the kererū was historically a major food source in Māori culture. However, due to the decline in its population, hunting is illegal. Customary use of kererū is restricted to the use of feathers and bones obtained from dead birds collected by DOC. This issue has received significant public and political attention, as some people argue that bans on kererū hunting are detrimental to Māori traditions. In 2018, the kererū was designated Bird of the Year by the New Zealand organisation Forest & Bird, and in 2019, the exoplanet HD 137388 b was renamed Kererū in its honour. (Full article...)
Selected general bird topic
A bird control spike, also known as an anti-roosting spike, pigeon spike, or roost modification, is a device consisting of long, needle-like rods used for bird control. Bird control spikes can be attached to building ledges, street lighting, and commercial signage to prevent wild or feral birds from perching or roosting. Birds can produce large quantities of unsightly and unhygienic feces, and some birds have very loud calls that can be inconvenient for nearby residents, especially at night. As a result, bird control spikes are used to deter these birds without causing them harm or killing them. In an unexpected adaptation, some birds have collected the spikes and used them in their nests. (Full article...)
Selected taxon
Nightjars are medium-sized nocturnal or crepuscular birds in the family Caprimulgidae /ˌkæprɪˈmʌldʒɪdiː/ and order Caprimulgiformes, characterised by long wings, short legs, and very short bills. They are sometimes called bugeaters, their primary source of food being insects. Some New World species are called nighthawks. The English word nightjar originally referred to the European nightjar.
Nightjars are found all around the world, with the exception of Antarctica, and certain island groups such as the Seychelles. They can be found in a variety of habitats, most commonly the open country with some vegetation. They usually nest on the ground, with a habit of resting and roosting on roads.
The subfamilies of nightjars have similar characteristics, including small feet, of little use for walking, and long, pointed wings. Typical nightjars have rictal bristles, longer bills, and softer plumage. The colour of their plumage and their unusual perching habits help conceal them during the day. (Full article...)
Topics
Anatomy: Anatomy • Skeleton • Flight • Eggs • Feathers • Plumage
Evolution and extinction: Evolution • Archaeopteryx • Hybridisation • Late Quaternary prehistoric birds • Fossils • Taxonomy • Extinction
Behaviour: Singing • Intelligence • Migration • Reproduction • Nesting • Incubation • Brood parasites
Bird orders: Struthioniformes • Tinamiformes • Anseriformes • Accipitriformes • Galliformes • Gaviiformes • Podicipediformes • Procellariiformes • Sphenisciformes • Pelecaniformes • Ciconiiformes • Phoenicopteriformes • Falconiformes • Gruiformes • Charadriiformes • Pteroclidiformes • Columbiformes • Psittaciformes • Cuculiformes • Strigiformes • Caprimulgiformes • Apodiformes • Coraciiformes • Piciformes • Trogoniformes • Coliiformes • Passeriformes
Bird lists: Families and orders • Lists by region
Birds and humans: Ringing • Ornithology • Bird collections • Birdwatching • Birdfeeding • Conservation • Aviculture
Quotes
| “ | The moment a bird was dead, no matter how beautiful it had been when in life, the pleasure arising from the possession of it became blunted... | ” |
Resources
Free online resources:
- SORA: The Searchable Online Research Archive (SORA) has decades worth of archives of the following journals: The Auk, The Condor, Journal of Field Ornithology, North American Bird Bander, Studies in Avian Biology, Pacific Coast Avifauna, and The Wilson Bulletin. Coverage ends around 2000. The ability to search all journals or browse exists on the front page.
- Notornis: The Journal of the Ornithological Society of New Zealand covers New Zealand and the South Pacific.
- New Zealand Journal of Ecology: This journal often publishes bird-related articles. Like Notornis, this journal is concerned with New Zealand and surrounding areas.
- Marine Ornithology: Published by the numerous seabird research groups, Marine Ornithology is specific and goes back many years.
- BirdLife International: The Data Zone has species accounts for every species, although threatened species and some key groups have greater detail with others only having status and evaluation.
- Author Index: This is a good source for binomial authorities for taxoboxes.
There is also Birds of North America, Cornell University's massive project collecting information on every breeding bird in the ABA area. It is available for US$40 a year.
For more sources, including printed sources, see WikiProject Birds.
WikiProjects
Selected images
- Chinese goose head at List of goose breeds
- Bald eagle at Bird of prey
- Photograph credit: John HarrisonThe plumed whistling duck (Dendrocygna eytoni) is a species of whistling duck native to Australia and New Guinea. Weighing around one kilogram (2.2 lb), it is a long-necked duck with brown upperparts, paler underparts and a white rump. The breast is chestnut-coloured with thin black bars, while long black-margined plumes arise from its flanks. The sexes are similar in appearance and its call is a characteristic whistle. This plumed whistling duck was photographed at Macquarie University, in New South Wales, Australia.
- Female mallard and ducklings at Burnaby Lake Regional Park
- Photograph credit: John HarrisonThe Pacific reef heron (Egretta sacra) is a species of heron found throughout southern Asia and Oceania. About 60 cm (24 in) in length, this species has two distinct colour morphs, charcoal-grey (as seen here) and pure white. The bird's diet consists mainly of fish, crustaceans and molluscs. This Pacific reef heron was photographed at Boat Harbour, in New South Wales, Australia.
- Photo credit: MdfThe Barred Owl (Strix varia), commonly known as the hoot owl, is a large typical owl. Its breeding habitat is dense woods across Canada, the eastern United States and south to Central America. They hunt at dawn, dusk, or night, by waiting on a high perch or flying through the woods and swooping down on prey. They mainly eat small mammals, such as mice and rabbits, and also small birds.
- Photo credit: Fir0002The Laughing Kookaburra (Dacelo novaeguineae) is a carnivorous kookaburra in the Kingfisher family well known for its laughing call. It is about 45 cm (18 in) in length and is found throughout eastern Australia and neighboring islands, and has been introduced to southwestern Australia as well as Kawau Island near New Zealand. Its trademark "laugh" is to establish territory amongst family groups. When one bird starts, often others will join in, including nearby birds from rival tribes, which can fill the bush with their calls.
- Photo credit: Noodle snacksThe Long-billed Corella (Cacatua tenuirostris) is a cockatoo native to Australia. The species can be found in the wild around western Victoria and southern New South Wales. Feral populations have sprung up in Sydney, Perth and Hobart from the release of unwanted birds. This has serious implications in Western Australia where they may hybridize with the endangered southern race of the Western Corella.
- Malurus cyaneus cyanochlamys, juvenile
- Female mallard in mid-flight at Flying and gliding animals
- Photograph: JJ HarrisonA male (top) and female eastern rosella (Platycercus eximius). These rosellas, which average 30 cm (12 in) in length, are native to southeastern Australia and Tasmania. The species, first described by George Shaw in 1792, is sometimes considered a subspecies of the pale-headed rosella; the two hybridize where their ranges meet.
- Rooster at Chicken
- Photograph: JJ HarrisonThe Siberian rubythroat (Luscinia calliope) is a small passerine bird generally considered to be an Old World flycatcher of the family Muscicapidae. This migratory insectivorous species breeds in mixed coniferous forest with undergrowth in Siberia, where it nests near the ground. It winters in Thailand, India and Indonesia. It is an extremely rare vagrant to Western Europe and the Aleutian Islands.
- Photograph: JJ HarrisonThe lesser whistling duck (Dendrocygna javanica) is a species of whistling duck that breeds in the Indian subcontinent and Southeast Asia. They are nocturnal feeders and during the day may be found in flocks around lakes and wet paddy fields. They can perch on trees and sometimes build their nest in the hollow of a tree. This brown and long-necked duck has broad wings that are visible in flight and produces a loud two-note wheezy call.
- Photograph credit: John HarrisonThe mangrove pitta (Pitta megarhyncha) is a species of passerine bird in the family Pittidae native to the eastern Indian subcontinent and the westernmost parts of Southeast Asia. In general, pittas are reclusive birds and difficult to observe, but this species is easier than most, calling from high in mangrove trees, and responding readily to recordings of its voice. This mangrove pitta was photographed at Pulau Ubin in Singapore.
- Photo: Richard BartzA pair of Mallards, an easily recognized species of dabbling duck that is found throughout the temperate and subtropical Americas, Europe, Asia, and North Africa, as well as Australia and New Zealand. The male birds have a bright green head (during breeding season) and are grey on wings and belly, while the females are brown all over. Both sexes have blue speculum feathers. Mallards live in wetlands, eat water plants and small animals, and are gregarious. This species is the ancestor of almost all of the breeds of domestic ducks.
- Photo: JJ HarrisonThe Wood Sandpiper (Tringa glareola) is a Eurasian wader. The smallest of the shanks, it is usually found near fresh water. This specimen, in non-breeding plumage, was found in Laem Phak Bia, Thailand.
- Photo credit: Noodle snacksThe Pacific Gull (Larus pacificus) is a very large (58–66 cm (23–26 in) in length) gull native to the coasts of Australia. It is less common than the Silver Gull, and its numbers have been declining in some parts due to competition from the Kelp Gull. Pacific Gulls are usually seen alone or in pairs.
- Photograph credit: Charles J. SharpThe tropical kingbird (Tyrannus melancholicus) is a large tyrant flycatcher, growing to a length of about 22 cm (8.7 in). It feeds on insects, either catching them in flight, or gleaning them from the surface of foliage, and also eats some fruit. The birds remain in pairs all year round, and drive intruders from their territories, including birds much larger than them. It nests high in trees, usually in the fork of a branch, building a bulky, untidy structure. The female incubates the typical clutch of two to four eggs and the young fledge in about 18 days. Its breeding range extends from the southern United States to central Argentina, with birds near the northern and southern limits of the range being migratory. This picture shows a T. m. melancholicus individual in the Pantanal, Brazil.
- Photo credit: Wolfgang WanderThe Eastern Screech Owl (Megascops asio) is a small owl native to eastern North America. Usually solitary, they nest in a tree cavity, either natural or excavated by a woodpecker; they will also use nesting boxes. They are strictly nocturnal, roosting during the day in cavities or next to tree trunks. They mainly eat large insects and small rodents, as well as small birds. They are active at night or near dusk, using their excellent hearing and night vision to locate prey.
- Photo: Fir0002A male Magpie-lark (Grallina cyanoleuca), a common Australian bird of small to medium size. Like many Australian birds, it was named for its physical similarity to the northern hemisphere birds familiar to European settlers. In fact, it is neither a magpie nor a lark and is not particularly closely related to either.
- The prothonotary warbler (Protonotaria citrea) is a small songbird of the New World warbler family. It breeds in hardwood swamps in southern Canada and the eastern United States and winters in the West Indies, Central America and northern South America.
Selected bird anatomy topic
A brood patch, also known as an incubation patch in older literature, is a patch of featherless skin on the underside of birds during the nesting season. Feathers act as inherent insulators and prevent efficient incubation, to which brood patches are the solution. This patch of skin is well supplied with blood vessels at the surface, enabling heat transfer to the eggs when incubating. In most species, the feathers in the region shed automatically, but ducks and geese may pluck and use their feathers to line the nest. Feathers regrow sooner after hatching in precocial birds than for those that have altricial young.
Upon settling on a nest, birds will shift in a characteristic side to side manner to ensure full contact of the brood patch with eggs or young. (Full article...)
Selected species
Did you know
- ...that the blue-throated piping-guan is a South American bird similar to a turkey?
- ...that despite only being eight inches tall, the tiny hawk, a raptor found throughout much of the central Neotropics, successfully hunts hummingbirds?
- ...that the blue-faced honeyeater of eastern and northern Australia is also known as the "bananabird" for its fondness for that fruit?
Categories
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More outstanding tasks at the project's cleanup listing, Category:Birds articles needing attention, and Wikipedia:WikiProject Birds/Todo.
Taxonomy of Aves
| Class Aves, divided into superorders, orders, suborders (where indicated), and families. | ||||
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Associated Wikimedia
The following Wikimedia Foundation sister projects provide more on this subject:
- Commons
Free media repository - Wikibooks
Free textbooks and manuals - Wikidata
Free knowledge base - Wikinews
Free-content news - Wikiquote
Collection of quotations - Wikisource
Free-content library - Wikispecies
Directory of species - Wikiversity
Free learning tools - Wikivoyage
Free travel guide - Wiktionary
Dictionary and thesaurus
Sources
- ^ Mead, D., ed. (1848). The American Literary Emporium. New York, NY, US: C. H. Camp. p. 209.
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