Spix's night monkey

Spix's night monkey, Aotus vociferans, also known as the Colombian gray night monkey or noisy night monkey, is a night monkey of the western Amazon, found in Brazil, Colombia, Ecuador and Peru. It is a small monkey of about a kilogram, with long arms that let it leap farther than most monkeys, and it moves through the forest by swinging between horizontal branches and leaping between trees. It lives in monogamous groups of a breeding pair and their young, and the father is the main carer of infants, passing them to the mother only to suckle. Mating and births fall between November and January. It communicates by voice, sight, smell and touch, with a high-pitched scream to startle predators and social sniffing between potential partners. It is wide-ranging and relatively abundant, and it is listed as Least Concern.