Brumback's night monkey

Brumback's night monkey, Aotus brumbacki, is a night monkey of Colombia that was long treated as a subspecies of the gray-bellied night monkey before researchers argued that it deserves full species rank. It belongs to the gray-necked group of night monkeys and was named by the primatologist Philip Hershkovitz in 1983. The only place it is known with certainty is the forests around Villavicencio in Meta Department on the eastern side of the Colombian Andes, and it is probably also present in several national natural parks of the region. It lives in closed canopy and gallery forest, usually in the lowlands, sleeping in tree holes or dense vegetation, in groups of an adult pair and their offspring. Fruit, insects and flowers make up its diet. Because forest clearance has been widespread across its range and its numbers are thought to have fallen sharply, it is listed as Vulnerable.