- any of various nightjars that feed on flying insects, esp., the common nighthawk (Chordeiles minor), which is active during the day or night
- night owl (sense )
- Any of several nightjars found throughout the Americas, having grayish-brown plumage that mimics leaves on the forest floor, especially Chordeiles minor. Also called bullbat . Also called mosquito hawk .
- Informal A night owl.