Pygmy Eagle
Hieraaetus weiskei
A small eagle of lowland and montane forest. Stocky body with streaky chest. Finely barred and fairly broad wings and tail fanned out in flight and black wing tips. Often soars low over the canopy. Pygmy Eagle has a different shape than the numerous sparrowhawks and goshawks, with a shorter, broader tail. Much smaller than other eagles. Similar in size to some kites but different underwing pattern. Call, a simple, high-pitched “piwit!” in flight.
识别特征
The pygmy eagle is one of the world's smallest-known species of eagle and smallest living member of the Aquilinae subfamily, only rivaled by the Great Nicobar serpent eagle in diminutive size by all modern species referred to as eagles. Pygmy eagle measures 38 to 48 cm (15 to 19 in) in length. The wingspan measures 112 to 126 cm (44 to 50 in). The female eagle is slightly larger than the male. One male pygmy eagle was found to weigh 483 g (1.065 lb). One study estimated the body mass of males of the species to fall around 406 g (0.895 lb) while that of females to fall around 555 g (1.224 lb).<p>The pygmy eagle shares many characteristics with its counterpart the little eagle. The most notable differences are color. The pygmy eagle has darker more pronounced streaks on the nape, crown and ventral. The bird also shares characteristics with the booted eagle, both eagles have a unique underwing pattern. The plumage of the pygmy eagle can vary depending on the morph, light or dark. The dark morph is very similar to the dark morph of the little eagle, while the light morph shows the most differences that occur in the dark streaking. The dark morph seems to be rarer as 10 out of 11 field sightings have been the light morph. The feet of the eagle are described as grey or dull yellow.<p>The voice of the pygmy eagle has been described as a "sip sip yeeee" during flights. The call can also be compared to the little eagle and booted eagle. The bird has also been observed giving a weaker single tone squeal.
分类信息
The pygmy eagle was described by German naturalist Anton Reichenow as Eutolmaetus weiskei in 1900. It was subsequently considered a subspecies of the little eagle or a distinct species. Gjershaug and colleagues analysed it genetically and found it distinct enough to warrant species status. The International Ornithologists' Union (IOC) subsequently recognised it as a distinct species. "Pygmy eagle" has been designated the official name by the IOC.
- 学名
- Hieraaetus weiskei
- 命名信息
- (Reichenow, 1900)
- 目
- Accipitriformes
- 科
- Accipitridae
- 属
- Hieraaetus
分布与栖息地
The pygmy eagle primarily resides in lowland forests and forest edges in New Guinea. They enjoy nesting in closed forestry but have also been seen in open habitat and forest edges. The bird seems to be sparsely distributed throughout the hilly forests of New Guinea; however much of the forests of New Guinea are inaccessible so the eagle may be more abundant than it seems. One of the densely forested parts of New Guinea is Vogelkop or Bird's Head Peninsula. The pygmy eagle has been observed nineteen times in the Vogelkop over three years. It has also been observed on the island Buru and in the northern Moluccas.
- 迁徙
- Resident species
保护状况
- 种群趋势
- declining
照片
分布
其他鸟类
Rufous-winged Illadopsis
Illadopsis rufescens
A mid-sized, chunky, drably colored babbler. Has a white throat and pale gray underparts, often with some darker olive-brown on the breast. Found in the understory of rainforest at low and middle elevations, usually in pairs. Shy and skulking, and rarely seen unless searched for. Similar to other illadopsises, and best located and distinguished by voice. Visually most similar to Puvel’s Illadopsis, but found in different habitat, slightly smaller, and grayer, less buffy, on the underparts. Paler below than Brown or Pale-breasted Illadopsises. Most often detected by distinctive voice: a series of several whistles in an up then down pattern that is weirdly reminiscent of trying to start a car.
Pallas's Sandgrouse
Syrrhaptes paradoxus
An unusual bird of dry plains and grasslands that looks like a cross between a dove and a grouse. Both sexes have a long, needle-thin tail, a rectangular black belly patch, and overall sandy-brown plumage. The male sports an orange-and-gray face and a pink tinge to his wings and back. The female is browner, with heavy speckling on the neck and nape. Flies in flocks, often gathering in groups of up to thousands strong at reliable waterholes.
Costa Rican Pygmy-Owl
Glaucidium costaricanum
Small owl, active during the day and night. Very similar in plumage to other pygmy-owls, but limited range at high elevation (mostly above 1000m) is a good starting point. Overall brown to rufous with white stripes on belly; look for small white spots on crown and bars on flanks. Sexes alike. Found singly or in pairs in montane forests. Listen for whistled song of doubled notes given on an even pitch.
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