Socotra Buzzard
Buteo socotraensis
A typical medium-sized brown-and-white buzzard that was only recognized as distinct in 2010. The underparts are whitish buff with heavily streaked underparts (lighter on the throat). Underwings display significant contrast, with pale primaries and secondaries standing out against black 'wrists' and rusty 'wingpits'. Juveniles are buffier and less heavily streaked. Uncommon resident endemic to Socotra, mostly between 150–800m, preferring ravines and cliffs; other buzzards are vagrants. Calls like other buzzards.
识别特征
The Socotra buzzard measures 45 cm in length. Adults typically have yellow-white abdomen and breast. They display fine brown streaking on their throat and breast, with the streaking being heavier on breast, abdomen, flanks, and thighs. Certain individuals display a white throat and upper breast. The species exhibits short, compact wings with a length of approximately 358 mm, a tail length of 188.5 mm, and a tarsus length of 65.19 mm. There is little difference in plumage between adults and juveniles, the main difference being in the intensity of the streaking on the underparts
分类信息
Although the species has been observed for more than 110 years, it wasn't recognized as an official species until 2010. Prior to that, it was assumed to be the same species as B. buteo. There has been much debate about the taxonomic position of the Socotra buzzard. It is genetically closest to the taxa rufinus and bannermani, but its plumage is most similar to the taxa trizonatus/oreophilus.
- 学名
- Buteo socotraensis
- 命名信息
- Porter & Kirwan, 2010
- 目
- Accipitriformes
- 科
- Accipitridae
- 属
- Buteo
分布与栖息地
Buteo socotraensis is found only on the island of Socotra, Yemen. The species lives in foothills and plateaux of the island, as well as places where one can find deep ravines. It is usually found at altitudes between 150–800 m. The species requires cliffs to nest, as it does not seem to be dependent on trees. As such, it has been observed that it might compete for nesting grounds with other bird species such as vultures, ravens, and falcons. According to the most recent population surveys, it has been suggested that there are fewer than 500 individuals on the island.
- 迁徙
- Resident species
行为
Only one sonogram has been made of B. socotraensis, and because of such a small sample size, this behavioural trait has not been included in its taxonomy. Its call is very similar to other species of the same genus, namely Buteo rufinus, B. buteo, and B. oreophilus . A key identifying characteristic of the species' call is the short period (<1 second) between calls. Its call has a frequency of 2.2 kHz, a similar but different frequency than other species in the same taxa.<p>The island of Socotra island has very scarce population of mammals, making the Socotra buzzard's diet consist of mainly reptiles and invertebrates. Its opportunistic hunting style makes it unlikely that it hunts on other species of birds.<p>Aerial tumbling and talon grappling have been observed as behaviour during breeding season, which usually occurs in September–April, with egg laying in September–January. They build their nests on cliffs or crevices, and their broods have been observed to range between 1-3 nestlings. Both male and females have been observed tending to their young, and remaining present during the post-fledging period. Nests have been found at altitudes of 150-650m, in shaded areas to protect them from the sun during the day.
保护状况
- 种群趋势
- declining
照片
分布
其他鸟类
Flores Heleia
Heleia crassirostris
A gray-and-white songbird with a diagnostic head pattern. Dark olive above and clean white below, with dark cheeks that contrast with the conspicuous pale eye and a white forehead bleeding into dark speckles on the crown. Juveniles show a plain buff forehead and crown. Found singly or in pairs in understory of forest and forest edge in lowlands and foothills, frequenting mixed-species flocks. Confined to the Lesser Sundas. Calls include soft “chup” and weak “pew” notes. Striking, melodious warbling song is punctuated with repeated clear trills and staccato “wit-wit-wit” phrases.
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Sultan Tit
Melanochlora sultanea
Highly social inhabitant of lowland forests, unlike any other tit in both size and coloration; coal-black with a bright yellow belly and sharply upswept crest. Closer in size to a medium-sized bulbul than to a Japanese or Coal Tit. Tends to stick to the canopy, where it readily associates with other species in mixed flocks. Very vocal, often giving squeaky, shrill calls. Song consists of repeated high-pitched whistles, sometimes with an inflected quality.
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