Although these birds are distinguished from the Caprimulgi by having a desmognathous palate, no basipterygoid processes nor oil-gland, by the possession of a powder-down patch on each side of the rump, and by widely different nidification, the Frogmouths, as they are called, are generally regarded as much more nearly allied to Nightjars than Swifts are. The sternum has a low keel and a pair of deep incisions on each side of the posterior border. The stomach is muscular. The nest is either built of twigs, or else is a pad or cup of down, leaves, moss, &c. placed on a branch, and the eggs are one or two in number, white and glossless. Young hatched helpless and downy. Habits nocturnal and insectivorous.
A single family.