Gray-breasted Crake
Laterallus exilis
Very small and elusive crake of damp grassy fields, brushy pastures, and marshes. Walks quietly and runs quickly, like all rails. Note the lime-green bill base and red eyes set off by a grayish face. Told from similar Black Rail by yellowish legs and unspotted upperparts. Heard much more often than seen; distinctive piping song easily passed over as a frog. Trilling call is drier than similar call of Ruddy Crake.
识别特征
The grey-breasted crake is 14 to 15.5 cm (5.5 to 6.1 in) long. Males weigh 26.5 to 39 g (0.93 to 1.4 oz) and females 29 to 43 g (1.0 to 1.5 oz). The sexes are alike. Adults have a pale gray head and breast, a white throat, and a chesnut nape. The rest of their upperparts are olive brown and their flanks are heavily barred black and white.
分类信息
The grey-breasted crake is monotypic, though the population along the Honduras-Nicaragua border was once proposed as a subspecies.
- 学名
- Laterallus exilis
- 命名信息
- (Temminck, 1831)
- 目
- Gruiformes
- 科
- Rallidae
- 属
- Laterallus
分布与栖息地
The grey-breasted crake has several discreet ranges. One is from Belize and eastern Guatemala through Honduras, Nicaragua, Costa Rica, and Panama into Colombia and western Venezuela. Another is in central Venezuela and a third extends through the Guianas into Brazil. The largest encompasses most of Amazonian Brazil, Colombia, Ecuador, and Bolivia and extends south through Paraguay into northeastern Argentina. It is also found in northwestern Ecuador, in several enclaves along coastal southeastern Brazil, and on Trinidad.<p>The grey-breasted crake inhabits a variety of landscapes. Most have shallow standing water, such as the edges of marshes, rivers, and lakes and also wet meadows and rice fields. It also occurs in dry sites like pastures and airfields.
- 迁徙
- Resident species
行为
The grey-breasted crake is thought to be sedentary, but some local movements are suspected.<p>The grey-breasted crake's foraging technique has not been described. Its diet is mostly insects of several orders and also includes spiders, worms, and seeds.<p>The grey-breasted crake's breeding seasons are not well defined but appear to vary geographically. It makes a sperical nest of woven grass and weed stems with a side entrance. The typical clutch size is three eggs.<p>The grey-breasted crake has several vocalizations including "a series of 2–10 'tink' or 'keek' notes; also [a] descending musical rattle and [a] quiet, sharp 'check'."
保护状况
- 种群趋势
- declining
照片
分布
鸟叫声
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A nest parasite that lays its eggs in the nests of Yellow-winged Pytilias. As with other whydahs, breeding males are spectacular and bizarre, whereas non-breeding males and females are drab and inconspicuous. Breeding males are mostly black with a rufous breast, a yellow back of the neck, and a long, narrow tail. Non-breeding male and female plumages are poorly known, but show a streaky brownish back and pale underparts. Generally scarce and local in savanna and cultivated areas. Breeding male similar to other paradise-whydahs, but has a longer and narrower tail. Separation of non-breeding male and female from other paradise-whydahs is poorly understood. Not very vocal, but does mimic Yellow-winged Pytilia vocalizations, which include simple, nasal “teew” notes.
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