Yellow thornbill | |
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Scientific classification | |
Domain: | Eukaryota |
Kingdom: | Animalia |
Phylum: | Chordata |
Class: | Aves |
Order: | Passeriformes |
Family: | Acanthizidae |
Genus: | Acanthiza |
Species: | A. nana |
Binomial name | |
Acanthiza nana | |
Subspecies [2] | |
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Distribution of the yellow thornbill |
The yellow thornbill (Acanthiza nana), formerly known as the little thornbill, is a tiny passerine bird endemic to the eastern coast of Australia. [3] While currently listed as Least Concern by the IUCN, the general consensus is that the population is decreasing. [1]
Acanthiza nana was named by Irish zoologist N. A. Vigors and American naturalist Dr Thomas Horsfield in 1827, with the bird noted in the Sydney Cove area. [4] However, the earliest field notes with type description record the yellow thornbill in 1803, with records sent at the time to the Linnean Society of London. [4] The generic name Acanthiza derives from Ancient Greek akantheōn 'thorn-brake' and zaō 'live, inhabit'. [5] The specific epithet nana is Latin for a 'female dwarf'. [5] The yellow thornbill is one of 13 currently recognised species of thornbill within the genus Acanthiza. [6] There are five species groups recognised within this genus, with the yellow thornbill (Acanthiza nana) most closely related to the striated thornbill (Acanthiza lineata). [6] The only Acanthiza species which occurs outside Australia, the New Guinea thornbill (Acanthiza murina), also bears close molecular similarities to both the yellow and striated thornbills. [6]
Although similar to the striated thornbill and brown thornbill in both size and shape, the yellow colour of the yellow thornbill is more prominent. [7] There is no sexual dimorphism, so that males and females look alike. [8] They are around 9 cm (3.5 in) in length, with an average wing span of 14 cm (5.5 in), and weighing between 6–7 g (0.21–0.25 oz). [7] [8]
The back feathers are greenish, the primary and secondary wing coverts are olive-brown with a paler edge on the primaries that contrast with the alula. [7] Upper- and under-tail are more dull than the rest of the body, and the same colour as the wings except for a dark brown-black subterminal band. [7] Their throat and chin is a pale buff-orange that blends into the soft, creamy-yellow of the breast. Legs, toes, and bill are all black. [7] Their eyes are dark brown with a grey outer-ring, although in some individuals the outer ring of the iris is almost white or pale brown. [8] The eye-ring is narrow and cream in colour. The lores are also cream, with a slight grey tone. Belly
Juveniles appear similar to adults, though feathers are "softer" looking and duller by comparison . When recently fledged, their gape is still yellow. The yellow feathers on their belly are more subdued, and back and head feathers are more brown than olive. [7]
The yellow thornbill likely breed in solitary pairs, but in some areas, evidence of co-operative breeding has been found. [7] Yellow thornbill nests are rounded and domed, with a small entrance near the top. Nests are usually made of bark-fibre and grasses matted together with spider-web, located in the upper foliage of shrubs and small trees. [7] Clutches of two to four eggs are laid soon after the nest has been completed, and are incubated for 16–17 days. [7]
The yellow thornbill has a loud, two-note tzid-id call, notably different from calls of the closely related striated thornbill by its harsher, less insect-like sound. The call is repeated at various intervals throughout the day and is associated with contact between birds while foraging, as defence, or as a territorial advertisement. [7]
Occasionally, yellow thornbills have been observed in feeding flocks of up to 35 individuals, as well as mixed-species feeding flocks. [7] More commonly, however, they are found in smaller groups or pairs. They prefer the upper and middle levels of forest canopy, and can be found moving rapidly through the outer foliage searching for food, or looking under bark. Their diet consists mostly of insects, but they will sometimes eat seeds. They will also catch insects mid-flight. [7]
Yellow thornbills are found mainly within temperate and semi-arid areas, with their range just extending into the subtropical zone. Within these zones, yellow thornbills are found in a variety of habitats including shrublands, forests and thickets, preferring vegetation dominated by casuarinas or eucalypts, particularly in areas with a drier climate. [7] Their range extends from northern and central west Queensland, south along the eastern coast of Australia through much of New South Wales, throughout Victoria and the Australian Capital Territory, and into the southeastern corner of South Australia.
Their current status according to the IUCN Red List is Least Concern, but with a decreasing population. [3] In developed areas such as towns or industrial sectors, the yellow thornbill has only been recorded in older development areas and not at all in more recently developed areas. [7] This correlates with observations of general bird populations in residential zones, with native birds decreasing when the native vegetation is removed. [9] Fire also affects population numbers, with only the oldest age-class present after fires. [7] In farmland which undergoes regular harvesting, yellow thornbills have not been recorded. [7] Fire, land development, agricultural insecticides and climate change have also led to a decrease in insect populations, which for a largely-insectivorous bird could potentially hold severe complications in the future. [10]
Pardalotes or peep-wrens are a family, Pardalotidae, of very small, brightly coloured birds native to Australia, with short tails, strong legs, and stubby blunt beaks. This family is composed of four species in one genus, Pardalotus, and several subspecies. The name derives from a Greek word meaning "spotted". The family once contained several other species now split into the family Acanthizidae.
Acanthiza is a genus of passeriform birds, most endemic to Australia, but with two species restricted to New Guinea. These birds are commonly known as thornbills. They are not closely related to species in the hummingbird genera Chalcostigma and Ramphomicron, which are also called thornbills.
The brown thornbill is a passerine bird usually found in eastern and south-eastern Australia, including Tasmania. It can grow up to 10 cm (3.9 in) long, and feeds on insects. It is brown, grey and white. The species has five subspecies.
The yellow-rumped thornbill is a species of passerine bird from the genus Acanthiza. The genus was once placed in the family Pardalotidae but that family was split and it is now in the family Acanthizidae. There are four subspecies of yellow-rumped thornbill. It is a small, brownish bird with a distinctive yellow rump and thin dark bill. It inhabits savannah, scrub and forests across most of Australia and eats insects. The species engages in cooperative breeding.
The eastern spinebill is a species of honeyeater found in south-eastern Australia in forest and woodland areas, as well as gardens in urban areas of Canberra, Sydney, Melbourne, Adelaide and Hobart. It is around 15 cm long, and has a distinctive black, white and chestnut plumage, a red eye, and a long downcurved bill.
The swift parrot is a species of broad-tailed parrot, found only in southeastern Australia. The species breeds in Tasmania during the summer and migrates north to southeastern mainland Australia from Griffith-Warialda in New South Wales and west to Adelaide in the winter. It is a nomadic migrant, and it settles in an area only when there is food available. The Swift Parrot was voted 2023 Bird of the Year in The Guardian Australia and BirdLife Australia's biennial poll.
The weebill is a species of bird in the family Acanthizidae. It is an insectivorous passerine that is found throughout mainland Australia. At 8 to 9 cm long, it is Australia's smallest bird. It was originally described by John Gould in 1838, and four subspecies are recognised. The weebill's plumage is nondescript, with olive-grey upperparts and paler, more yellowish underparts. It grades from more brownish plumage in the southern regions of Australia to more yellow in tropical areas.
The brown honeyeater is a species of bird in the family Meliphagidae. It belongs to the honeyeaters, a group of birds which have highly developed brush-tipped tongues adapted for nectar feeding. Honeyeaters are found mainly in Australia, New Guinea, and parts of Indonesia, but the brown honeyeater is unique in that it also occurs on the island of Bali, making it the only honeyeater to be found west of the Wallace Line, the biogeographical boundary between the Australian-Papuan and Oriental zoogeographical regions.
The striped honeyeater is a passerine bird of the honeyeater family, Meliphagidae, found in Australia. It is a medium-sized honeyeater, about 23 cm (9.1 in) in length. Both sexes are a light greyish brown with dark brown centres to the feathers, which give the appearance of stripes. The stripes are particularly distinct on the head and back of the neck. While it is found mainly in inland eastern Australia where it inhabits the drier open forest, it is also found in coastal swamp forest from southeast Queensland to the central coast of New South Wales.
The buff-rumped thornbill is a small passerine bird species belonging to the genus Acanthiza, most of which are endemic to Australia. Measuring 8–10 cm in length, this unassuming thornbill is characterised by its plain greenish brown upperparts and very pale-yellow underparts, with a distinctive buff coloured rump. The tail has a broad, blackish band with a paler tip. Adults possess white irises, whilst juveniles have dark eyes. The buff-rumped thornbill is one of 14 species within the genus Acanthiza genus, which are recognisable by their thin, pointed bill. Species are unique in their plumage and distribution. Despite their shared name, the genus is not related to hummingbirds.
The olivaceous thornbill is a species of hummingbird in the "coquettes", tribe Lesbiini of subfamily Lesbiinae. It is found in Bolivia and Peru.
The slender-billed thornbill is a small bird native to Australia. It includes three sub-species:
The inland thornbill was originally described by English ornithologist John Gould in The Birds of Australia. Inland thornbills are within the order passerines. The inland thornbill belongs to the genus Acanthiza, which now has three more species than the eleven outlined by Gould in The Birds of Australia. The Noongar people of southwestern Western Australia call A. apicalis "Djoobi-Djoolbang". The inland thornbill is also known as the broad-tail thornbill and presently contains several subspecies that were once considered independent species. The word apicalis comes from the Latin for 'tipped'.
The Tasmanian Thornbill is a small bushland member of the Acanthizidae family, endemic to Tasmania and the Bass Strait Islands. It is a common bird in these regions and is often found occupying the colder, wetter portions of them. The brown thornbill will typically occupy the correspondingly drier portions of habitat.
The striated thornbill is a species of bird in the family Acanthizidae. It is endemic to Australia, where its natural habitat is subtropical or tropical dry forests.
The chestnut-rumped thornbill is a small passerine bird in the family Acanthizidae, endemic to Australia.
The rufous fieldwren also known as the desert wren or sandplain wren is a species of insectivorous bird in the family Acanthizidae, endemic to Australia.
The black honeyeater 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.
The grey honeyeater is a species of bird in the honeyeater family. It is an uncommon and little-known bird, an often overlooked endemic of remote areas in central Australia.
The western yellow robin is a species of bird in the Australasian robin family, Petroicidae, native to Australia. Described by John Gould in 1838, the western yellow robin and its Australian relatives are not closely related to either the European or American robins, but they appear to be an early offshoot of the Passerida group of songbirds. Ranging between 13.5 and 15.5 cm long, it has grey upperparts, and a grey breast and head, broken by whitish streaks near the bill and below the eye, with a conspicuous yellow belly. The sexes are similar in appearance. Two subspecies are recognized: subspecies griseogularis, which has a yellow rump, and subspecies rosinae with an olive-green rump.
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