Northern Beardless-Tyrannulet
Camptostoma imberbe
Tiny flycatcher found in Mexico and Central America. In the U.S. restricted to riparian woodland with dense understory and mesquite in the Southwest. Plain gray overall with inconspicuous pale wingbars and pale yellowish belly. Peaked bushy crown. Similar to Empidonax flycatchers but note bushy crest, blunter bill, and less obvious wingbars. Generally quite active. Often detected by song: a series of descending plaintive whistles "dee dee dee dee."
识别特征
The northern beardless tyrannulet (Camptostoma imberbe) is a small passerine bird in the tyrant flycatcher family. It breeds from southeasternmost Arizona and Texas of the United States through Mexico and Central America to northwestern Costa Rica. This species is found in light forests, cultivation and gardens with trees. The domed nest is made of plant fibre or leaves with a side entrance. The nest is placed by a tree fork. The typical clutch is two white eggs, which are marked with rufous and lilac mostly at the larger end. Incubation by the female is 14–15 days to hatching, with another 17 days to fledging. The northern beardless tyrannulet is 10.2 cm (4.0 in) long, and weighs 7.5 g (0.26 oz). The head is dark brown with an erectile crest and pale supercilium. The upperparts are grey-green becoming paler on the rump. The wings are brown with yellow feather-edging and two whitish wing bars. The tail is brown, the throat grey, the breast yellowish, and the abdomen yellow. The bill is pinkish. Sexes are similar, and this species always appears not as bright, especially with regard to the wing bars, as the closely related southern beardless tyrannulet, C. obsoletum, with which it was once considered conspecific. However, the two forms overlap without interbreeding in Costa Rica. Northern beardless tyrannulets are active birds, feeding in a vireo or warbler-like fashion on insects, spiders and berries. The call is a loud whistled Fleeeeeerrr, sometimes broken up as a fleeer-it, or a flee-flee-flee-flee. In courtship, or when alarmed, the crests are raised, the tail flicked, and an excited call is made.
分类信息
Genus: Camptostoma; Family: Tyrannidae; Order: Passeriformes.
- 学名
- Camptostoma imberbe
- 命名信息
- Sclater, PL, 1857
- 目
- Passeriformes
- 科
- Tyrannidae
- 属
- Camptostoma
分布与栖息地
- 迁徙
- Resident species
行为
Migration pattern: Resident species.
保护状况
Population trend: declining.
- 种群趋势
- declining
照片
分布
鸟叫声
其他鸟类
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