Though some forms like "Neocathartes" were capable of flight, larger taxa like "Paracrax" were flightless, constituting examples of flightless birds in mammal dominated environments.
Though some forms like "Neocathartes" were capable of flight, larger taxa like "Paracrax" were flightless, Cracraft, J.1968. American Museum Novitates; no.2326 constituting examples of flightless birds in mammal dominated environments.