Red-billed Buffalo-Weaver

A light gray medium-sized tern. Black cap extends to bill in breeding plumage. Bill and legs red. In non-breeding birds, cap reduced to just the area behind the eye, bill has dull pinkish color, and underparts are white. Breeds in the circumpolar subantarctic region. Generally known to stay close to their breeding sites. Migrating Arctic Tern could occur in the same area, but not in breeding plumage, and would show more prominent black markings on outer primaries. White-fronted Tern can be distinguished by its larger body, lighter coloring, and longer, thinner, all-black bill.

Rare and endangered hummingbird found in the Andes of southwestern Colombia. Accessing its tiny known range is difficult, and only a few intrepid and lucky birders have seen one. Male looks quite dark, but has a glittering blue throat bordered on both sides by iridescent green as well as white leg puffs and a blue vent. Female is mostly green with a buffy tinge to the underparts, faint whisker marks, and smaller leg puffs; she is similar to female Glowing Puffleg, but typically has a fainter throat patch and less buff on the neck. Inhabits stunted cloud forest at high elevations.

Fairly small tanager of pine-oak and tropical forest in foothills and highlands of Mexico; endemic. Found mainly in the canopy, usually in pairs or small groups that sometimes join mixed-species feeding flocks. Distinctive male has brilliant red head (with small black mask), greenish upperparts, and yellow underparts. Female is rather drab greenish and yellow overall with dusky gray cheeks. Female looks similar to female Hepatic Tanager but much smaller with smaller, stubbier bill and paler belly. Calls are high twitters similar to Bushtit.