The yellow bishop, Cape bishop, Cape widow or yellow-rumped widow (Euplectes capensis) is a resident breeding bird species in eastern and southern Africa. This common weaver occurs in less arid vegetated areas, such as fynbos, moist grassland and bracken-covered valleys at altitudes from sea level to the Kenyan highlands.
The yellow bishop is a stocky 15 centimetres long bird. The breeding male is black apart from his bright yellow lower back, rump, and shoulder patches, and brown edging to the wing feathers. He has a short crest, thick conical black bill, and a relatively short tail. His bill size varies dramatically between races.
In non-breeding plumage, the black plumage is replaced by heavily streaked buffy-brown, and the bill is pale. The yellow shoulders and rump remain, and are a distinction from the female which lacks the contrasting colour patches. The juveniles and females are notoriously difficult to identify in the field, appearing identical to the juveniles and females of several other bishops and widowbirds as well as some seadeaters.
In the breeding season they are usually solitary or in pairs, but the non-breeding yellow bishop is gregarious, often forming flocks with other 'mixed euplectes'.
They feed on seed, grain and some insects.
Source : Wikipedia