A small, uncommon hummingbird with a peculiar bill. Male appears mostly dark green, whereas female is green above and white below with a black line down center of breast. Bill is short, straight, and upturned at the tip. Found locally in drier habitats including savanna, forest edge, and dry zones on large granite outcrops, where it is most frequently seen around flowering trees or perched on bare branches. Feeds on nectar and hawks for insects either in hovering flight or from perches. Best told from other hummingbirds by distinctive bill; in plumage both male and female resemble respective sexes of Black-throated Mango, but awlbill is much smaller with.