Oilbird (Steatornis caripensis)

The Guácharo (Steatornis caripensis) is an iconic nocturnal cave-dwelling bird found in the mountainous regions and rainforests of northern South America. It measures between 40 and 50 cm, with mottled grayish-brown plumage, long wings, and a prominent tail. It has large eyes adapted to darkness and a keen sense of hearing. It feeds mainly on oily fruits, which it collects at night thanks to its agile flight. It lives in large colonies inside deep, humid caves.

Fun fact: it is one of the few birds in the world that navigates in the dark by echolocation, emitting nasal clicks similar to those of bats, which makes it unique among fruit-eating birds