A medium-sized sunbird with an olive back and gray belly. Male has a metallic bluish (may appear green in some light) hood and breast; female appears plain-headed with limited metallic plumage on crown. Immature like female, but darker and duller. Singles and pairs are uncommon residents of riparian forest, forest-edge, and broadleaved Miombo woodland. Sings a series of short jumbled high-pitched notes. Compared to similar Green-headed Sunbird, smaller Bannerman’s Sunbird has a shorter, straighter bill, and mostly blue head (duller on female), lacking an obvious green crown.