Size small. Bill conical,"compressed, pointed, the culmen slightly curved and angulate, the nostrils and chin-angle concealed by dense plumes with black bristles projecting. Wing and tail rounded. Toes 4. Orbits feathered. Plumage soft, lax, and elongate.
A large genus comprising 33 species, of which all but two are South American ; one inhabits China, and one is Indian.