Tahiti Swiftlet
Aerodramus leucophaeus
A medium-sized swiftlet with a relatively long forked tail. Mostly brown with very slightly paler brown underparts and a more golden-brown rump. Most common over rocky riverine valleys and humid forests. Similar to Atiu Swiftlet but is less contrastingly patterned, overall more uniformly brown, with a paler rump and a proportionally longer tail. Also extremely similar to Marquesan Swiftlet, but appears paler-faced and lacks a pale collar. Call is an insect-like buzzing and trilling.
识别特征
Aerodramus leucophaeus is closely related to the species of the A. Sawtelli. Characteristics include slightly short wings, forked tail, dark brown upperparts, and grey brown underparts. Birds' wings typically get shorter the closer they live to the equator, explaining why these swiflets are located closer to the Southern Island region. This is due to the fact that the bird's short wings are not equipped to travel far distances, causing the bird to remain in relatively restricted areas for most of its life. This bird is about 11 cm with a forked tail.<p>They have a dry call with repeated intervals. The call is also heard as insect-like and trilling. The trilling sound is usually associated with high pitched sounds. Birds hear at a much quicker frequency than humans, allowing them to understand this call.<p>It has been reported that this species has some form of echolocation.<p>Bird echolocation is limited to a lower frequency, having poorer resolution than that of echolocation in bats and other animals. This low frequency makes the echolocation audible to humans. Birds such as the swiftlet use echolocation to locate their way around dark caves and nesting locations in order to settle safely.
分类信息
- 学名
- Aerodramus leucophaeus
- 命名信息
- (Peale, 1849)
- 目
- Apodiformes
- 科
- Apodidae
- 属
- Aerodramus
分布与栖息地
- 迁徙
- Resident species
保护状况
Currently this species is not globally threatened. They are classified as vulnerable, but stable. This is due to predation on eggs. It is typical of this species to lay two eggs at a time. Nests of this species are made with vegetable matter and held together by saliva.[citation needed] This species remains rare, surviving in only a few valleys and continue to be a priority to conserve. They are mostly found in flocks, (up to 100).<p>Total population estimate of 200–500 birds in 1984 and currently still thought to number fewer than 1000 individuals of which the most important subpopulation (100 birds) is in Papehue Valley.
- 种群趋势
- stable
照片
分布
其他鸟类
Giant Antshrike
Batara cinerea
Huge antshrike with a rather long tail and a strong, heavily hooked bill. Males are barred black and white above and gray below, with a black cap that can be erected. Females look similar, but are barred black and cinnamon above and buff below with a cinnamon cap. Usually seen in pairs in the dense understory and middle levels of humid forests mostly in and around bamboo patches.
Rock Bush-Quail
Perdicula argoondah
A squat and rotund bush-quail. Males have a dull chestnut forecrown and face, a thin white eyebrow over a dark brown eyeline that broadens behind the eye. Lightly barred brown above and boldly barred in black and white below. Females have a similar but duller head pattern with vinaceous underparts without barring. Note the slaty gray bill and orange legs. Found in pairs or family groups in dry rocky areas with scrub. Secretive, but its musical trill followed by rapidly ascending piping notes is often heard.
Hepatic Tanager
Piranga flava
Large, stocky tanager. Males are red with dusty wash on upperparts and sides (especially on northern populations); females are muted yellowish. Both sexes are brightest on the throat and crown. Also note stout bill and dark lores. Several separate populations occur from the southwestern U.S. to South America, probably comprising multiple different species. Northern birds prefer mountainous areas with mixed pine-oak forest. South American birds found in a variety of forested habitats, from open woodlands in the lowlands to scrubby areas in the high Andes. Most similar to Summer Tanager, but grayer tones to plumage and usually different habitat. Song is sweet like American Robin: mostly clear phrases with some hoarser notes.
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