Whitehead's spiderhunter

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Whitehead's spiderhunter
ArachnotheraJuliaeKeulemans.jpg
Illustration of Whitehead's spiderhunter by John Gerrard Keulemans
Scientific classification OOjs UI icon edit-ltr.svg
Domain: Eukaryota
Kingdom: Animalia
Phylum: Chordata
Class: Aves
Order: Passeriformes
Family: Nectariniidae
Genus: Arachnothera
Species:
A. juliae
Binomial name
Arachnothera juliae
Sharpe, 1887
Arachnothera juliae map.svg

Whitehead's spiderhunter (Arachnothera juliae) is a species of spiderhunter in the sunbird and spiderhunter family Nectariniidae. It is endemic to Borneo, where it is found in the mountain ranges in the north-central part of the island. It inhabits hill dipterocarp forest, primary and secondary montane forest, and forest edge at elevations of 930–3,000 m (3,050–9,840 ft). A large and distinctive spiderhunter, the species is mostly brown with profuse whitish streaking all over the body and bright yellow vents and uppertail coverts . Both sexes are similar in appearance, but males are larger, with a length of 16.5–18 cm (6.5–7.1 in) compared to a length of 15.5–16.5 cm (6.1–6.5 in) for females. The juvenile plumage is unknown.

Contents

The species feeds on small arthropods, berries, and nectar, foraging alone, in pairs, or in small flocks of up to five birds. It breeds from March to at least August, making bark-lined nests in hollows it excavates in naturally occurring clumps of moss, vegetation, and roots. This nest is unique within its genus and is shared only with the closely related yellow-eared and naked-faced spiderhunters. Clutches consist of two chicks, which are fed berries and arthropods. It is listed as being of least concern by the International Union for Conservation of Nature, but is experiencing a population decline caused by habitat destruction.

Taxonomy and systematics

In 1887, the British ornithologist Richard Bowdler Sharpe described Whitehead's spiderhunter as Arachnothera juliae on the basis of specimens collected from Mount Kinabalu, Borneo by the British explorer John Whitehead. [2] The name of the genus is from the Ancient Greek arakhnēs, meaning spider, and thēras, meaning hunter. The specific name is in honour of Julia Charlotte Sophia, the wife of the Scottish ornithologist Arthur Hay. [3] Whitehead's spiderhunter is the official common name designated by the International Ornithologists' Union and is in honour of Whitehead. [4] [5]

Whitehead's spiderhunter is one of 147 species in the sunbird and spiderhunter family Nectariniidae. Within the family, it is one of 13 species in the spiderhunter genus Arachnothera . [4] A 2011 phylogenetic study by the ornithologist Robert Moyle and colleagues found Whitehead's spiderhunter to be most closely related to a clade (a group of all the descendants of a common ancestor) formed by the yellow-eared and naked-faced spiderhunters. [6]

Description

A Whitehead's spiderhunter in Kinabalu Park, Malaysia Arachnothera juliae 102416853 (cropped).jpg
A Whitehead's spiderhunter in Kinabalu Park, Malaysia

The species is a large, distinctive spiderhunter, with males having a length of 16.5–18 cm (6.5–7.1 in) and females having a length of 15.5–16.5 cm (6.1–6.5 in). It is mainly brown with profuse streaking on the head and body, buffy white streaking on the top of the head, narrow white streaks on the neck and back, fine brownish-white streaking on the throat, and broad white streaking on the rest of the underparts . The vent and uppertail coverts are bright yellow. The iris is brown, while the legs and bill are black. Both sexes look similar, while the juvenile plumage is unknown. [7] [8]

Whitehead's spiderhunters have very distinctive vocalisations, with a high-pitched, squeaky song. Their calls include a wheezy wee-chit, with the first note rising and second note falling in pitch, a complex series of nasal and wheezy wit-wit-wit-wt’wt’wt’weehee twitters and trills, and a teeh-teeh-wee, with the wee rising in pitch. Other calls are a see-wee see-wee, a swee-eee-eee, a tee-tee-swee-ee, prolonged twittering, and loud shrieks made in flight or while perched. [7] [8]

Distribution and habitat

Endemic to Borneo, Whitehead's spiderhunter is found in mountain ranges in the north-central part of the island, from Mount Kinabalu to the Dulit Range and Kayan Mentarang. It inhabits hill dipterocarp forest, primary and secondary montane forest, and forest edge at elevations of 930–3,000 m (3,050–9,840 ft). [7] [8]

Behaviour and ecology

The species is relatively sedate and has a generation length of 4.2 years. [1] [8]

Feeding

Whitehead's spiderhunter feeds on small arthropods, berries, and nectar. It feeds alone, in pairs, or in groups of up to five birds, occasionally joining mixed-species foraging flocks. Foraging is usually conducted in the canopy, but the species will sometimes lower down at forest edges. It searches for food in foliage, particularly within clumps of epiphytes high up in the forest, and has been observed probing Rhododendron flowers. [7]

Breeding

The breeding season of Whitehead's spiderhunters lasts from March to at least August and males with enlarged testes have been collected in June and November. The species' nests are bowls lined with fine, fibrous bark, made inside a hollow in naturally-occurring clumps of moss, vegetation, and roots. The clumps are suspended at a height of 10–19 m (33–62 ft) from the ground and hollows are excavated by the spiderhunters by removing vegetation from the clumps. The nest bowls have a diameter of 7 cm (2.8 in) and a depth of 4 cm (1.6 in), while the entrance to the hollow has a diameter of 5 cm (2.0 in). Whitehead's spiderhunter's nest structure is unique within its genus and is only shared with the closely related yellow-eared and naked-faced spiderhunters; other spiderhunters usually make nests out of leaves, lined with fibrous material, entered through a narrow opening, and attached to the underside of banana leaves or palm fronds. Clutches consist of two chicks, which are fed berries and arthropods. [9] [10]

Status

Whitehead's spiderhunter is listed as being of least concern by the International Union for Conservation of Nature due to its fairly large range, sufficiently large population, and a lack of significant population decline. It was previously considered near-threatened and its population is thought to currently be declining due to habitat destruction. It is present in some protected areas like Kinabalu Park and Rafflesia Forest Reserve. [1] [7]

Related Research Articles

<span class="mw-page-title-main">Sunbird</span> Family of birds

Sunbirds and spiderhunters make up the family Nectariniidae of passerine birds. They are small, slender passerines from the Old World, usually with downward-curved bills. Many are brightly coloured, often with iridescent feathers, particularly in the males. Many species also have especially long tail feathers. Their range extends through most of Africa to the Middle East, South Asia, South-east Asia and southern China, to Indonesia, New Guinea and northern Australia. Species diversity is highest in equatorial regions.

<span class="mw-page-title-main">Spiderhunter</span> Genus of birds

The spiderhunters are birds of the genus Arachnothera, part of the sunbird family Nectariniidae. The genus contains thirteen species found in the forests of south and southeastern Asia. They are large representatives of the sunbird family, with drab plumage and long strongly curved bills. They feed on both nectar and a range of small arthropods.

<span class="mw-page-title-main">John Whitehead (explorer)</span> English explorer and zoologist

John Whitehead was an English explorer, naturalist and professional collector of natural history specimens in Southeast Asia. He is the first documented person to reach the summit of Mount Kinabalu: this was in 1888, after annual attempts from 1885.

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

The Bornean stubtail is a species of bird in the cettiid warbler family Cettiidae. It is endemic to the island of Borneo, where it inhabits forest floors and undergrowth in montane forests at elevations of 750–3,150 m (2,460–10,330 ft). It is a small, short-tailed warbler, measuring 9.5–10 cm (3.7–3.9 in) in length and having an average mass of 10.4 g (0.37 oz). The tops of the head and the upperparts are brown, with whitish underparts that turn grey at the sides of the breast and the flanks. The supercilium is long and buffish-brown, with an equally long dark grey eyestripe and a thin yellow eye-ring. Both sexes are similar.

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

The brown-throated sunbird, also known as the plain-throated sunbird, is a species of bird in the family Nectariniidae. It is found in a wide range of semi-open habitats in south-east Asia, ranging from Myanmar to the Lesser Sundas and west Philippines. The grey-throated sunbird found in the remaining part of the Philippines is often considered a subspecies of the brown-throated sunbird, but the two differ consistently in measurements and plumage, and there is no evidence of intergradation between them.

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

The yellow-eared spiderhunter is a species of bird in the family Nectariniidae. It is found in Brunei, Indonesia, Malaysia, Myanmar, Singapore, Thailand, and Vietnam. Its natural habitats are subtropical or tropical moist lowland forests, subtropical or tropical mangrove forests, and subtropical or tropical moist montane forests.

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

The Bornean spiderhunter is a species of bird in the family Nectariniidae. The scientific name commemorates British colonial administrator and zoological collector Alfred Hart Everett.

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

The spectacled spiderhunter is a species of bird in the family Nectariniidae. It is found in Brunei, Indonesia, Malaysia, Singapore, Thailand, and Vietnam. Its natural habitats are subtropical or tropical moist lowland forest and subtropical or tropical moist montane forest. This is both the largest spiderhunter and the largest representative of the entire sunbird family. The total length of this species is around 22 cm (8.7 in) and body mass is around 38.4 to 49 g.

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

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

The streaked spiderhunter is a species of bird in the family Nectariniidae.

<span class="mw-page-title-main">Hose's broadbill</span> Species of bird endemic to Borneo

Hose's broadbill is a species of bird in the family Calyptomenidae. It was described by the British naturalist Richard Bowdler Sharpe in 1892 and is named after the British zoologist Charles Hose, who collected the holotype of the species. It is 19–21 cm (7.5–8.3 in) long, with females weighing 92 g (3.2 oz) on average and males weighing 102–115 g (3.6–4.1 oz). Males are bright green and have conspicuous black spots on the wings, black markings on the head, blue underparts, black flight feathers, and a large green tuft covering most of the bill. Females have smaller forehead tufts, lime-green underparts with sky blue instead of azure blue on the undertail coverts, and lack black markings on the head, except for a black spot in front of the eye.

<span class="mw-page-title-main">Whitehead's broadbill</span> Species of bird endemic to Borneo

Whitehead's broadbill is a species of bird in the family Calyptomenidae. It is endemic to the mountain ranges of north-central Borneo, where it mainly inhabits montane forests and forest edges at elevations of 900–1,700 m (3,000–5,600 ft). It is 24–27 cm (9.4–10.6 in) long, with males weighing 142–171 g (5.0–6.0 oz) and females weighing 150–163 g (5.3–5.7 oz). Males are vivid green and have a black throat patch, black spots on the ear-coverts and back of the neck, and black markings and streaking all over the body. The tails and flight feathers are also blackish. Females are smaller and lack the black markings on the head and underparts. Juveniles look similar to adults but have fewer black markings.

<span class="mw-page-title-main">Black-sided flowerpecker</span> Species of bird

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<span class="mw-page-title-main">Copper-throated sunbird</span> Species of bird

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References

  1. 1 2 3 BirdLife International (2016). "Arachnothera juliae". IUCN Red List of Threatened Species . 2016: e.T22718131A94569006. doi: 10.2305/IUCN.UK.2016-3.RLTS.T22718131A94569006.en . Retrieved 12 November 2021.
  2. Sharpe, Richard Bowdler (1887). "Notes on a collection of birds made by Mr. John Whitehead on the mountain of Kina Balu, in northern Borneo, with descriptions of new species". Ibis . London: Academic Press. 29 (4): 451–452. doi:10.1111/j.1474-919x.1887.tb06626.x. ISSN   0019-1019. OCLC   1377260 via Biodiversity Heritage Library.
  3. Jobling, James A. (2010). Helm Dictionary of Scientific Bird Names. London: Christopher Helm. pp. 52, 212. ISBN   978-1-4081-2501-4. OCLC   1040808348 via Biodiversity Heritage Library.
  4. 1 2 Donsker, David; Gill, Frank; Rasmussen, Pamela (eds.). "Dippers, leafbirds, flowerpeckers, sunbirds". IOC World Bird List. Retrieved 2022-04-01.
  5. Beolens, Bo (2003). Whose Bird? Men and Women commemorated in the common names of birds . London: Christopher Helm. pp. 364–365. ISBN   0-7136-6647-1.
  6. Moyle, Robert G.; Taylor, Sabrina S.; Oliveros, Carl H.; Lim, Haw Chuan; Haines, Cheryl L.; Rahman, Mustafa A.; Sheldon, Frederick H. (2011). "Diversification of an endemic Southeast Asian genus: Phylogenetic relationships of the spiderhunters (Nectariniidae: Arachnothera )". The Auk . 128 (4): 782–783. doi: 10.1525/auk.2011.11019 . hdl: 1808/13332 .
  7. 1 2 3 4 5 Cheke, Robert; Mann, Clive (2020-03-04). Billerman, Shawn M.; Keeney, Brooke K.; Rodewald, Paul G.; Schulenberg, Thomas S. (eds.). "Whitehead's Spiderhunter (Arachnothera juliae)" . Birds of the World. Cornell Lab of Ornithology. doi:10.2173/bow.whispi1.01. S2CID   216197447 . Retrieved 2022-04-03.
  8. 1 2 3 4 Myers, Susan (2016). Birds of Borneo: Sabah, Sarawak, Brunei and Kalimantan. Illustrated by Richard Allen, Hilary Burn, Clive Byers, Daniel Cole, John Cox, Anthony Disley, Alan Harris, Szabolcs Kokay, Mike Langman, Ian Lewington, Andrew Mackay, Stephen Message, Christopher Schmidt, Jan Wilczur, and Tim Worfolk (Second ed.). London: Christopher Helm. p. 314. ISBN   978-1-4729-2444-5. OCLC   944318084.
  9. Yeo, Siew Teck; Yong, Ding Li (2021). "Observations of nesting Whitehead's Spiderhunter Arachnothera juliae in northern Sarawak, Malaysian Borneo". BirdingASIA. 36: 103–105.
  10. Brady, Matthew L.; Burner, Ryan C. (2015). "First description of the nest of Whitehead's Spiderhunter (Arachnothera juliae, Aves: Nectariniidae)". The Wilson Journal of Ornithology . 127 (4): 752–755. doi:10.1676/15-040. ISSN   1559-4491. S2CID   86307629.