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nightjar,common name for birds also known as goatsuckersgoatsucker,
common name for nocturnal or crepuscular birds of the order Caprimulgiformes, which includes the frogmouth, the oilbird, potoos, and nightjars. Goatsuckers are medium in size and are found in the temperate and tropical zones of both hemispheres.
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any nocturnal bird of the family Caprimulgidae, esp Caprimulgus europaeus (European nightjar): order Caprimulgiformes. They have a cryptic plumage and large eyes and feed on insects
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005