Tamaulipas Crow
Corvus imparatus
Small glossy crow, common in northeast Mexico. Occurs in towns, villages, rubbish dumps, farmland, and semiopen areas with hedges and taller trees. Social and usually in flocks, at times of hundreds. Most likely to be confused with male Great-tailed Grackle, which has pale eyes and longer and keel-shaped tail (shed in late-summer molt). Chihuahuan Raven much larger, with much heavier bill and different voice. Calls of Tamaulipas Crow are low, froglike croaks.
识别特征
It is a relatively small and sleek looking crow, 34–38 centimetres (13–15 in) in length. It has very glossy dark, bluish plumage, which appears soft and silky. The bill is quite slender and black, as are the legs and feet. The Chihuahuan raven, a much larger and very different bird, is the only crow it commonly occurs alongside.
分类信息
The Sinaloa crow (Corvus sinaloae) appears to be genetically extremely close to this bird and can be considered the western form of it though the voice is quite different, indeed a third species, the fish crow (Corvus ossifragus) of the southeastern United States appears to be very closely related to them also and the three may be considered a superspecies.
- 学名
- Corvus imparatus
- 命名信息
- Peters, JL, 1929
- 目
- Passeriformes
- 科
- Corvidae
- 属
- Corvus
分布与栖息地
Occurring in a relatively small area in northeastern Mexico, it inhabits near desert scrub and bushland and includes farms, small towns and villages in its range. It also occurs in more humid woodland in open areas but does not appear to be found in the higher mountains or along the seashore. It is a sociable bird often forming large flocks, moving together in close groups. Its northern range reaches Brownsville in southern Texas where it has been known to nest.
- 迁徙
- Resident species
行为
Food would appear to be mainly insects taken on the ground though eggs and nestlings are taken in trees as well as many fruits and berries.<p>The nest is similar to the American crow but smaller and is built in a tree or large bush.<p>The voice of this crow is unusual and unlike most other species of the genus Corvus. It has a low croaking sound rather like a frog and a call that is described as a soft "gar-lik".
保护状况
- 种群趋势
- declining
照片
分布
鸟叫声
其他鸟类
Eurasian Wren
Troglodytes troglodytes
Tiny brown bird that often holds its short little tail cocked up. Often sings from a fairly exposed perch, but at other times rather mouselike, creeping in brambles and understory. As such, can be quite inconspicuous. Favors wooded areas with a dense understory, as well as gardens, hedges in farmland, heathland, and coastal cliffs. Heard much more than seen: song is loud, bright, and musical, a varied series of trills and ringing warbles, repeated. Chipping calls can also give away its presence.
Gray-headed Silverbill
Spermestes griseicapilla
A small, chunky, large-billed, distinctively marked waxbill. The gray head is speckled with fine white spots. There is sharp contrast between the brown back, the white rump, and the black tail, which is especially obvious in flight. Found locally in both dry and moist savanna and woodland, usually in grassy areas. Usually in flocks. The most common call is a quiet “tsip.”
Eastern Spinebill
Acanthorhynchus tenuirostris
A small bird with a long curved bill. Adults have an obvious dark cap (black on males and gray on females) and mask with dark marks down the side of the chest. Note the white corners to the fanned tail that can be obvious in flight. Young birds are plain buff-colored underneath and plain brown above. Young birds could be confused with female Scarlet Myzomela (Scarlet Honeyeater), but note longer bill of spinebill. Eastern Spinebills are active and fast, darting around quickly between flowering trees in wetter forested areas as well as parks and gardens. Voice is a loud repetitive piping whistle.
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