An occipital crest, small in females. Bill about as long as the head, tapering throughout, culmen straight; nostril large, about one-third the distance from base to tip of bill. "Wing short, pointed; tail rounded, of 16 feathers (occasionally 18 may be found); legs situated far back; tarsus very short, foot large. A single caecum only according to Blyth.
There is but one species.