Andean Ibis

Dark iridescent pigeon with a triangular throat patch the darkness of which varies geographically; it is white to pale gray across most of the range but dark in the Lesser Sundas. Found over a wide range of altitudes, from lowland into montane forests and edge. Often found in close proximity to human settlements, particularly on small islands. Forages in trees and on the ground. Vocalizations vary slightly; gives both deep booming coos and a higher pitched “COOroo...COOroo...COOroo..”

Fairly dull vireo, intermediate between Blue-headed and Plumbeous. Grayish-olive overall, but with yellowish flanks and greenish back. Note white spectacles contrasting with gray head and two whitish wingbars. Breeds in mixed coniferous forests, especially in mountainous areas; winters in Mexico. Often separable from Blue-headed and Plumbeous Vireos by range, but can overlap during migration and winter. Cassin's is less contrasty than Blue-headed, especially between the gray face and whitish throat, and the greenish back blends into the nape and crown. Some birds are best left unidentified.

Small, handsome swallow of boulder-strewn rivers. Black-and-white pattern is distinctive but can be surprisingly hard to discern in bright sunlight. Note long-tailed profile and habitat. When gliding, often appears to hold wings below the horizontal. Seldom if ever encountered away from rocky rapids, around which groups cluster, sitting directly on rocks and flying about, chasing insects. Tends not to fly higher than treetop level. Often found with the more widespread White-banded Swallow.