This largest of the barbets is colorful, but often appears all-dark from a distance. No other barbet in its range combines the features of a massive pale bill, black head, and dark olive back. Sluggish and shy; tends to stick to dense forest canopy, where it is difficult to see. Its loud hooting song (typically a series of two repetitive notes) is often the only indication of this species’s presence. Also gives a harsh, screaming “karrrrr” that has a gull-like quality.