A small black hornbill with an ivory-colored bill that has a reddish smudge at the base and a knob on top. There is a pale blue pouch of skin below the bill. Males have a rich chestnut neck that becomes a darker burnt red around the face and top of the head. Females have black necks and heads. Juveniles resemble male, with a smaller bill. Confined to Sumba, where it is the only hornbill. Inhabits lowland and foothill forest and forest edge, where it frequents the treetops singly or in groups. Calls include a fast-paced, emphatic “kokokokokokok…”.