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(Steatornis caripensis), nocturnal bird of South America that lives in caves and feeds on fruit, mainly the nuts of oil palms. The oilbird is an aberrant member of the order Caprimulgiformes; it comprises the family Steatornithidae. About 30 centimetres (12 inches) long, with fanlike tail and long broad wings, it is dark reddish brown, barred with black and spotted with white. It has a strong hook-tipped bill, long bristles around the wide gape, and large dark eyes.