Large, rare, enigmatic terrestrial cuckoo, typically very difficult to find. Has a long tail, a strong pale bill, and a black crest. Told from regionally-occurring subspecies of Rufous-vented Ground-Cuckoo by its pale loral region and throat. Often attends army-ant swarms, but also often follows herds of peccaries, groups of monkeys, or mixed flocks of birds. The song is deep and hollow, recalling a dove. Also produces bill snaps, possibly mimicking peccaries.