Yellow-bellied Whistler

Small, uncommon tanager of humid tropical lowland forest, sometimes found at army ant swarms. Typically inhabits low to mid-levels of shady understory, as singles or pairs. Sexes look alike, with bushy gray head cleanly cut off from the rich yellow underparts and olive-green upperparts. Song is a rich squeaky warble, at times prolonged.

Similar in size and shape to House Sparrow. Breeding season males have a heavily streaked black breast and back and a rufous crown and nape. Males are duller in the nonbreeding season. Females are very difficult to separate from female House Sparrows but tend to have bigger bills and paler bellies. Colonial, builds huge stick nests, often in/under White Stork nests.

A big, chunky, relatively colorful rainforest greenbul. Mostly olive-green, with a reddish tail and a mostly gray head. The throat feathers are long and often puffed out; they are rich yellow in most of the range, but pale yellow in Nigeria. Found in the understory and at middle levels of rainforest and gallery forest. Usually in small, noisy groups that often join mixed flocks. Similar to Yellow-bearded Greenbul, but larger, with a puffier throat and some gray in the plumage. Similar to Red-tailed Greenbul, but larger, and never shows a pure white throat. Somewhat similar to Icterine Greenbul, but larger, and much darker on the breast and belly. The loud and distinctive call is a rising, two-part “truwa-treeeaa.”