Gray-hooded Sierra Finch

Smallest gull in the world. Compact with short legs, short rounded wings, and small bill. Breeding adults have black head, pale gray back, white wingtips, and blackish underwings. Nonbreeding adults have a black ear patch and smudgy cap. Immatures are similar to nonbreeding adults but with a black “M”-shaped pattern on the upperwing, especially noticeable in flight. When perched, this looks like a thick horizontal stripe across the wing and shoulder. Primarily a Eurasian species, breeding in marshy wetlands and wintering offshore or in coastal waters. Uncommon to rare in North America, where typically found singly among flocks of Bonaparte’s Gulls on lakes, beaches, estuaries, or bays. Note adult Little Gull's smaller size, white wingtips, dark underwings, and more rounded wings compared to Bonaparte's.

Overall rusty-colored, medium-sized flycatcher of humid tropical forest in the lowlands. Favors middle to upper levels inside forest, where sits still for long periods and sallies out for insects and other small critters. Call is a distinctive slow wolf-whistle—“whee-wheeu,” given at infrequent intervals and easily imitated. Note the overall rusty plumage, slender bill, and behavior. Can be confused with slightly larger Rufous Piha, which has a bushier face, paler throat, and a very different voice.

Unusual gray turaco with a long tail and bushy crest. White bars in the outer wing are conspicuous in floppy flight. Found in savanna, woodland, shrubby cultivation, and gardens. Usually in small groups. Loud and vocal. The call is a series of yelps that accelerate and become louder, usually given in a wild duet or chorus. Very similar to Eastern Plantain-eater, but there is very little overlap in range; Western can be distinguished by the lack of white in the tail and the black-spotted rather than barred back.