Very large, primarily ground-based cuckoo. Adults are streaked rusty brown in nonbreeding plumage. In breeding plumage the head and front are black. They can fly, but are more typically seen running/flapping across roads, or clumsily crashing into dense vegetation. Unlike many cuckoos this species builds its own nest and does not lay eggs in nests of other species. Voice is a familiar repeated ‘whoop,’ and a screeching cat-like hiss.