oilbirds or guacharos
   Oilbird, or guacharo the type of a peculiar family, related both to the nightjars and to the frog-mouths. The guacharo, Steatomis caripensis, found in northern South America, and in Trinidad, is noc­turnal and feeds chiefly on fruits. It nests on ledges in the interior of caves near the sea, forming a heavy bowl of mud and feathers to hold its white eggs. The fat of the nestlings yields a valuable oil.