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
Little Flycatcher
Muscicapa epulata
An easily overlooked petite bird of lowland forests that frequents edges, clearings, and even old farms. A typical small, grayish flycatcher with a white throat and belly, a streaky gray chest, black legs, and a mostly dark bill with a pale base. Similar to other African flycatchers, especially Yellow-legged Flycatcher, but note the black legs and streaky chest. Song is a jumble of high-pitched notes and buzzes, and the flight call is a high-pitched “zee.”
Asian Emerald Dove
Chalcophaps indica
Brightly-colored dove of the forest floor with bright green wings, coral-red bill, and ash-gray forehead. Male has an extensive silver cap which the female lacks. Inhabits various forested habitats from lowlands up into montane areas. Often encountered when flushed from a well-shaded trail. Gives a series of solemn-sounding hiccuping coos: “ti-woo, ti-woo, ti-woo.”
Long-tailed Rosefinch
Carpodacus sibiricus
Large, plump finch of the boreal forest. Adult males are pink overall with two white wingbars and pale gray highlights. Immature males and females are not so bright but still subtly pretty; gray body with olive, yellow, or burnt-orange head and rump. Stubby bill with rounded edges. Song consists of rich, mellow warbles; listen for musical flight calls. Breeds in open coniferous forests. Winters in a variety of wooded habitats, especially around fruiting trees including crabapple and mountain ash. Often extremely tame, allowing close approach.
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