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Oilbird | Steatornithiformes
Vetzwaluwen | Guácharo
This order consists of a single family with a single species, the Oilbird, a nocturnal fruit-eater of northern South America and Trinidad. It belongs to the large group of relatives that also includes the potoos, nightjars, swifts and hummingbirds, but occupies a separate, old branch within it. What sets the order apart is the combination of a nocturnal way of life with a diet of fruit: the birds fly out to the forest at night and pluck fruit from palms, laurels and other trees, swallowing it whole; the seeds are regurgitated later, so that the species disperses seeds over long distances. They roost and breed in colonies in caves, where they find their way in total darkness by means of audible clicks, a form of echolocation known from only a few birds. In the region the order occurs only on Trinidad, in caves in the mountains of the north of the island and in sea caves along the coast and on the small islands off it.
Families in this order
- Oilbird | Steatornithidae1 speciesThe Oilbird (Steatornis caripensis) is the only member of the family: a large, rufous-brown bird with white, black-edged spots, a wingspan of about one metre and a long, graduated tail. The bill is strong and sharply hooked, surrounded by long bristles, and the eyes are large and dark. By day the birds sit packed together on ledges in caves; at dusk they fly out to look for fruit of palms, laurels and other trees, which they pluck while hovering and probably locate partly by smell. Inside the cave they orient themselves with short clicks that are audible to people, and when disturbed they give loud, harsh screams. The nest is a cone-shaped mound of regurgitated fruit remains on a ledge, used over many years. The young are fed on oily fruit and grow heavier than the adults. In the region the species lives only on Trinidad, in caves in the Northern Range and in sea caves along the coast.