Oriole warbler
The oriole warbler ("Hypergerus atriceps") is a large warbler in the family Cisticolidae, and the only member of the genus Hypergerus. This bird is a resident breeder in west Africa from southern Senegal to Cameroon and north Zaire. This skulking passerine is typically found in dense thickets usually near water. The oriole warbler builds a large untidy nest suspended from palm leaves. These 20-cm long warblers have a long tail, strong legs and a long black bill. At a weight of around the oriole warbler may be the largest of the species-rich Cisticolidae family. Adults are  light olive above, yellow below and have a black hood. The species' name refers to their resemblance to the unrelated but similarly black and yellow orioles. The sexes are similar, but juveniles are duller. Like most warblers, the oriole warbler is insectivorous. The song is a loud whistled duetted "toooo-ooo-eee-oooo, oooo-ooo-eee-oooo". The male always leads the duet and the female answers, though this is done in a manner that is temporarily rather loose.