One-colored Becard

Often draws attention to its presence by its song: an ascending sequence of “kwa” notes, similar to Green-backed Trogon, but faster. Two subspecies occur in Brazil, Paraguay, and northeastern Argentina with limited geographical overlap that vary in the color of the breast and eyering; the southern one has a red belly and eyering, while the northern one has a yellow belly and eyering. The males of both subspecies have a violet-blue head and breast, a green back, and a white undertail. Females have a dull gray breast and the undertail is gray with white tips. Found in the middle to upper levels of forests and woodlands.

Smallest swift in most of range. All dark gray with contrasting pale rump and paler throat, both of which can be difficult to see in many viewing conditions. A good look at the rump is necessary for a firm visual identification, otherwise Vaux’s Swift can look very similar. However, in some parts of its range (the Osa Peninsula, for example) this is the only small Chaetura swift. Makes twittering calls similar to many other swifts. Usually found in flocks over forests and more open areas.

Medium-sized bush warbler. Brown with a white throat, pale buffy brow, and rufous crown. Gray-sided Bush Warbler is similar but smaller, with a whiter brow stripe and paler, more gray-toned sides. Chestnut-crowned can be separated from other bush warblers by a combination of its size, bright rufous crown, and strong head pattern. Breeds in foothill and montane areas up to the treeline; prefers dense shrubby areas, particularly with an abundance of rhododendrons. In the winter, descends into lower foothill and lowland areas with scrubby edge growth. Song is a sharp, high “tih-wih-wih-wihr.” Calls include a sharp, bunting-like “tseep.”