Oilbirds, also called guácharos, are found throughout N South America and on the island of Trinidad. As much as 13 in. (33 cm) in body length, with wingspans up to 3 ft (91 cm), they are rich brown in color with black bars and scattered white spots. They have hooked beaks surrounded by stiff, whiskerlike hairs. The beaks are used to pluck fruit while the bird hovers in the air it never perches. Oilbirds are also the only nocturnal, fruit-eating birds.
Oilbirds nest in large colonies on high, rocky cave ledges, often a good distance into the cave. The female lays two to four eggs per clutch, which hatch in about 33 days. The naked young are fed on rich, oily fruits and become grotesquely fat, reaching twice the adult weight at their maximum size. They lose this
baby fat when their feathers begin to grow in. In the past, baby oilbirds were captured, and their fat boiled down for torch oil, hence their name.
Oilbirds are classified in the phylum Chordata , subphylum Vertebrata, class Aves, order Caprimulgiformes, family Steatornithidae.
The Columbia Electronic Encyclopedia, 6th ed. Copyright © 2012, Columbia University Press. All rights reserved.
See more Encyclopedia articles on: Vertebrate Zoology
Browse by Subject
- Earth and the Environment +-
- History +-
- Literature and the Arts +-
- Medicine +-
- People +-
- Philosophy and Religion +-
- Places +-
- Australia and Oceania
- Britain, Ireland, France, and the Low Countries
- Commonwealth of Independent States and the Baltic Nations
- Germany, Scandinavia, and Central Europe
- Latin America and the Caribbean
- Oceans, Continents, and Polar Regions
- Spain, Portugal, Italy, Greece, and the Balkans
- United States, Canada, and Greenland
- Plants and Animals +-
- Science and Technology +-
- Social Sciences and the Law +-
- Sports and Everyday Life +-