Whitehead's spiderhunter | |
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Illustration of Whitehead's spiderhunter by John Gerrard Keulemans | |
Scientific classification | |
Domain: | Eukaryota |
Kingdom: | Animalia |
Phylum: | Chordata |
Class: | Aves |
Order: | Passeriformes |
Family: | Nectariniidae |
Genus: | Arachnothera |
Species: | A. juliae |
Binomial name | |
Arachnothera juliae Sharpe, 1887 | |
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.
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.
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]
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]
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]
The species is relatively sedate and has a generation length of 4.2 years. [1] [8]
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]
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]
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]
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.
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.
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.
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.
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.
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.
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.
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.
The little spiderhunter is a species of long-billed nectar-feeding bird in the family Nectariniidae found in the moist forests of South and Southeast Asia. Unlike typical sunbirds, males and females are very similar in plumage. They are usually seen in ones or twos and frequently make a tzeck call. They are most often found near flowering plants where they obtain nectar.
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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.
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.
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