Yellow thornbill

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Yellow thornbill
Acanthiza nana - Wianamatta Reserve.jpg
Scientific classification OOjs UI icon edit-ltr.svg
Domain: Eukaryota
Kingdom: Animalia
Phylum: Chordata
Class: Aves
Order: Passeriformes
Family: Acanthizidae
Genus: Acanthiza
Species:
A. nana
Binomial name
Acanthiza nana
Vigors & Horsfield, 1827
Subspecies [2]
  • A. n. flava - White, HL, 1922
  • A. n. modesta - De Vis, 1905
  • A. n. nana - Vigors & Horsfield, 1827
Yellow Thornbill.png
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]

Contents

Taxonomy

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]

Description

Adult yellow thornbill (Acanthiza nana). Yellow Thornbill (Acanthiza nana) (14878710853).jpg
Adult yellow thornbill (Acanthiza nana).

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]

Adults

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

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]

Behaviour

Yellow thornbill (Acanthiza nana) feeding young in the nest. Yellow Thornbill (Acanthiza nana) (22451338928).jpg
Yellow thornbill (Acanthiza nana) feeding young in the nest.

Breeding

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]

Vocalisation

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]

Feeding and diet

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]

Habitat and distribution

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.

Conservation

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]

Related Research Articles

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<i>Acanthiza</i> Genus of birds

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.

<span class="mw-page-title-main">Brown thornbill</span> Species of bird

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.

<span class="mw-page-title-main">Yellow-rumped thornbill</span> Species of bird

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.

<span class="mw-page-title-main">Eastern spinebill</span> Species of bird

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<span class="mw-page-title-main">Weebill</span> Species of bird

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.

<span class="mw-page-title-main">Brown honeyeater</span> Species of bird

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.

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<span class="mw-page-title-main">Buff-rumped thornbill</span> Species of bird

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<span class="mw-page-title-main">Tasmanian thornbill</span> Species of bird

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References

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  2. "IOC World Bird List 10.2". doi:10.14344/IOC.ML.10.2.{{cite journal}}: Cite journal requires |journal= (help)
  3. 1 2 BirdLife International (2012). "Acanthiza nana". IUCN Red List of Threatened Species . 2012. Retrieved 26 November 2013.
  4. 1 2 Campbell, A. G. (1926-01-01). "Thornbills of the Genus Acanthiza". Emu - Austral Ornithology. 25 (3): 184–198. Bibcode:1926EmuAO..25..184C. doi:10.1071/MU925184. ISSN   0158-4197.
  5. 1 2 Jobling, James A. (2010). "Helm Dictionary of Scientific Bird-names" . Retrieved 2020-05-08.
  6. 1 2 3 Nicholls, James A. (March 2001). "Molecular systematics of the thornbills, Acanthiza". Emu - Austral Ornithology. 101 (1): 33–37. Bibcode:2001EmuAO.101...33N. doi:10.1071/MU00064. ISSN   0158-4197. S2CID   82927731.
  7. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 Higgens, P. J.; Peter, J. M., eds. (2002). Handbook of Australian, New Zealand, and Arctic Birds. Vol. 6: Pardalotes to shrike-thrushes. Melbourne: Oxford University Press. ISBN   0195537629.
  8. 1 2 3 Bird, Delys (1990-10-01). "Review by Delys Bird". Australian Literary Studies. doi:10.20314/als.26f3bbfef0. ISSN   0004-9697.
  9. Blair, Robert B. (May 1996). "Land Use and Avian Species Diversity Along an Urban Gradient". Ecological Applications. 6 (2): 506–519. Bibcode:1996EcoAp...6..506B. doi:10.2307/2269387. ISSN   1051-0761. JSTOR   2269387.
  10. Chittka, Lars; Vasas, Vera (2017-11-02). "F1000Prime Recommendation of [Hallmann CA et al., PLoS ONE 2017 12(10):e0185809]". F1000Prime. doi: 10.3410/f.732005636.793538384 .
    Hallmann CA, et al. (October 18, 2017). "More than 75 percent decline over 27 years in total flying insect biomass in protected areas". PLOS ONE. 12 (10). e0185809. Bibcode:2017PLoSO..1285809H. doi: 10.1371/journal.pone.0185809 . PMC   5646769 . PMID   29045418.