Olive-capped Warbler

A nest parasite that lays its eggs in the nests of Purple Grenadiers. As with other whydahs, breeding males are spectacular, whereas non-breeding males and females are drab. Breeding males are mostly black, with golden-buff coloring on the cap, the belly, and the elongated central tail feathers. Non-breeding males and females have a brownish back, a golden-buff head, and a red bill. Found in rather dry savanna and cultivated areas. Non-breeding male and female can be identified by their red bill and their almost unmarked plain buff head. Not very vocal, but does imitate Purple Grenadier, and gives a quick jumble of high-pitched whistled notes. 

A large heavily built duck that is uncommon to fairly common along rocky seacoasts; not found on lakes, unlike Flying Steamer-Duck. Both sexes are steely blue-gray overall, brighter than Flying Steamer-Duck, with a stouter and deeper-based bill. The bill of both male and female is bright orange in the southern parts of its range, but is orange with a greenish distal patch around Chiloé Island (likely a different species). The bill of juvenile birds is duller grayish to dull yellowish; attains adult color by winter.

Handsome, poorly-known sparrow with a bright olive back and a black-and-white face pattern. Note the yellow bill with a black upper ridge. Has a restricted distribution in the Sao Francisco valley, where it is found in scrubby areas of caatinga, usually foraging on the ground. The song is a series of high-pitched, vibrant notes: “twip-twip tsip-tsip-tsip-tsip.”