One extinct species, the Jamaican poorwill, is included. One species, the common poorwill, even enters a state of hibernation. In the Chuckwalla Mountains, naturalist Edmund C. Jaeger discovered the hibernating common poorwill. The ocellated poorwill ("Nyctiphrynus ocellatus") is a species of nightjar in the family Caprimulgidae. The common poorwill ("Phalaenoptilus nuttallii") is a nocturnal bird of the family Caprimulgidae, the nightjars. The Yucatan poorwill ("Nyctiphrynus yucatanicus") is a species of nightjar in the family Caprimulgidae.