Gray-headed Kite
Leptodon cayanensis
Scarce hawk of lowland tropical forest. Perches mainly in the canopy, at times giving a long, laughing call. In flight, the wingbeats are loose and floppy. When soaring the wings are held rather level. Adult is distinctive, with a soft gray head, dark eyes (no yellow in the face, unlike most hawks), and rather small grayish feet. Immature has several plumage types, all with 2–3 broad, pale-gray tail bands. One type has a dark brown head and upperparts and whitish underparts with dark streaking; another has a white head and underparts with a small dark cap.
识别特征
The gray-headed kite is 46–53 cm in length and weighs 410-605 g. The adult has a grey head, black upperparts, white underparts, and a black tail with two or three white bars. The bill is blue and the legs grey. The flight is a deliberate flap-flap-glide.<p>Immature birds have three colour morphs; the light phase is similar to the adult, but has a white head and neck, with a black crown and eyestripe, black bill and yellow legs, closely resembling the Black-and-white hawk-eagle (Spizaetus melanoleucus). The rufous phase has a reddish neck with a white throat, black malar stripes and a black, long crest closely resembling the adult Ornate hawk-eagle (Spizaetus ornatus). The dark phase has a blackish head, neck and upper parts, and dark-streaked buff underparts closely resembling the Black hawk-eagle (Spizaetus tyrannus). The sophistication in the mimicry of these juveniles is remarkable and has only been described a few times.
分类信息
- 学名
- Leptodon cayanensis
- 命名信息
- (Latham, 1790)
- 目
- Accipitriformes
- 科
- Accipitridae
- 属
- Leptodon
分布与栖息地
- 迁徙
- Resident species
行为
The gray-headed kite feeds mainly on reptiles such as arboreal geckos, other lizards and snakes, but also takes frogs, molluscs and large insects (including larvae and combs of hornets, wasps and bees). It also feeds on eggs, young or injured birds. It usually sits on an open high perch from which it swoops on its prey. The call is a mewling keow. The nest is made of sticks lined with grass and is built high in a tree. The clutch is one or two white eggs, purplish at one end and spotted brown.
保护状况
- 种群趋势
- declining
照片
分布
鸟叫声
其他鸟类
Red-winged Prinia
Prinia erythroptera
Long-tailed warbler with pale underparts and a rufous wing. The color of the head and back is grayish in breeding plumage and brown in non-breeding plumage. Found in areas of lush woodland with tall grass. Usually in the undergrowth, but will perch up sometimes, as when singing. The song is a fast series of whistled calls by one bird, often accompanied by “tik” notes from another. Similar to Tawny-flanked Prinia, but separated by the rufous wing and lack of a pale eyebrow.
Oahu Elepaio
Chasiempis ibidis
A small flycatcher of forested habitats on Oahu. Adults are brown above, whitish below, and have white wingbars, rump, and tail tips. Immatures are reddish brown and have buffy wingbars. Uncommon and local on Oahu, more numerous in valleys. Bold and curious; not afraid of people and may follow hikers. Often holds tail cocked up at an angle. Male song is a shrill “El-eh-pie-oh” for which the species is named. Both sexes give a variety of soft calls and scolding notes. Responds to pishing and squeaking.
White-headed Mousebird
Colius leucocephalus
Like all mousebirds, has a distinctive shape: a chunky body, a long tail, and a shaggy crest. Gray-brown overall with a mostly silvery-white head. Note the pale blue-gray bill with a dark tip. There is a white slash on the back that can be conspicuous in flight. Small groups are found in dry savanna and thorn scrub. The calls include quiet “tet” notes and a rollicking series of squeaky notes. Similar to Speckled Mousebird, but generally found in drier habitat and separated by the white crest, the barred back, and the mostly pale bill.
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