Rio Negro Gnatcatcher
Polioptila facilis
A rarely encountered, mostly gray gnatcatcher of the canopy. Has slate gray upperparts and breast with a contrasting white belly, and a white eyering. Tail is long and slender with white outer feathers. Sexes similar. Restricted to white sand forests in lowlands Amazonia of Brazil, Colombia, and Venezuela. Actively moves through the canopy, often joining mixed species feeding flocks. Voice is a fast “fui fui fui fui.” Very similar to Guianan Gnatcatcher, but note differences in voice and range.
分类信息
- 学名
- Polioptila facilis
- 命名信息
- Zimmer, JT, 1942
- 目
- Passeriformes
- 科
- Polioptilidae
- 属
- Polioptila
照片
分布
鸟叫声
其他鸟类
Thick-billed Spiderhunter
Arachnothera crassirostris
Dull and largely unmarked spiderhunter. Brownish olive above with a yellow belly, faint yellow crescents around the eye, and faint speckling on the crown. Gives insistently harsh, nasal chattering calls that seem disproportionate for its small size. Forages in the middle levels of foothill and lowland rainforests, gleaning insects and sipping nectar from flowers.
Pearl Kite
Gampsonyx swainsonii
Very small raptor found in open spaces, often perched on a telephone wire or exposed tree. Size alone helps with identification. Even smaller than a kestrel, with unmarked white underparts and gray back. Also look for buffy forehead and cheek and rusty flanks. Sexes alike. Usually seen singly around open fields.
Dark-rumped Swift
Apus acuticauda
A rare and highly range-restricted dark swift lacking any white on the lower back. Underparts can have a white-fringed appearance, but may sometimes appear uniform due to wear. Note contrast between belly and solid black undertail. Combination of namesake dark rump and dark face distinguishes this species from other similar “fork-tailed swifts.” Breeds in damp forested hills with waterfalls, steep cliffs, and ledges; forages over other habitats as well. Gives high, thin calls, as well as chittery trilling screams.
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