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common name for an owllike, cave-dwelling bird, Steatornis caripensis, belonging to the family Steatornithidae. It spends its days in dark caves, maneuvering by means of a batlike sonar device, or echolocator, found in its ears. The oilbird emits a clicking sound at an audible frequency of 7,000 cycles per sec, unlike the bat's cry, which is supersonic. Hence the pulsations of the oilbird can be easily detected by the human ear while the bird is in flight. For night-flying, the bird depends upon its large, highly light-sensitive eyes.

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 ChordataChordata
, phylum of animals having a notochord, or dorsal stiffening rod, as the chief internal skeletal support at some stage of their development. Most chordates are vertebrates (animals with backbones), but the phylum also includes some small marine invertebrate animals.
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, subphylum Vertebrata, class Aves, order Caprimulgiformes, family Steatornithidae.



(Steatornis caripensis), the only species of the family Steatornithidae, order Caprimulgiformes. Body length, up to 55 cm. The plumage is chestnut brown with transverse color variations and light speckles. It is found in the mountains of northern South America and on the island of Trinidad.

The oilbird feeds at night; it finds its food, which consists of fruits of the palm and of laurel trees, apparently by using its sense of smell. It digests only the flesh of fruits, regurgitating the seeds. It nests in groups in caves, orienting itself in the dark by means of echolocation. It builds its nest from a mixture of regurgitated fruit pulp, seeds, and saliva. There are two to four eggs in a clutch. The nestlings remain in, the nest up to four months and become very fat.


Snow, D. W. “The Natural History of the Oilbird in Trinidad.” Zoológica, 1961, vol. 46, part 1; 1962, vol. 47, part 4.
References in periodicals archive ?
227 The oilbird (Steatornis caripensis) lives in the mountainous areas of equatorial America at elevations of between 2,300 ft (700 m) and 9,800 ft (3,000 m).
Palm fruits in the diet of the oilbird, Steatornis caripensis.
The secret life of oilbirds: new insights into the movement ecology of a unique avian frugivore.
otus (Linnaeus), long-eared I R owl Athene cunicularia (Molina), W R burrowing owl Bubo virginianus (Gmelin), great I C horned owl Nyctea scandiaca (Linnaeus), snow N R owl Otus asio (Linnaeus), eastern I C screech-owl Strix varia Barton, barred owl I O Order Caprimulgiformes goatsuckers, oilbirds, and allies) Family Caprimulgidae (goatsuckers) Caprimulgus carolinensis Gmelin, S R chuck-will's-widow C.
But the worst nightmare was when he joined camerawoman Justine Evans and producer Jo Sarsby in a cave in Venezuela to film Oilbirds. The cave was stinking and infested with cockroaches, mice, vampire bats ...
They gathered, in all, 175 miles (280 kilometres) of film, using infra-red cameras to find oilbirds deep in pitch-black caves and ultra-slow motion film to unravel the complexities of bird flight.
Oilbirds (Steatornis caripensis) are probably efficient long-distance dispersers of palms (Snow & Snow, 1978; Herzog & Kessler, 1997), and it has been suggested that they affect the seedling distribution of Oenocarpus bataua var.