What nocturnal primate is also called the 'owl monkey'?

The night monkey is a nocturnal primate also called the owl monkey.

Night monkeys belong to the New World monkey genus Aotus, whose name means “earless” because their small ears are largely hidden by fur. Their enormous brown eyes help them see in dim conditions, and their activity after dark explains both common names: “night monkey” describes their schedule, while “owl monkey” refers to their owl-like facial appearance.

The genus includes eleven species found in Panama and much of South America. Night monkeys live in forests ranging from tropical rainforests to cloud forests, sometimes at elevations up to about 2,400 metres. They eat fruit, leaves, flowers, insects, and other small food items.

They are unusual among primates because they are generally the only truly nocturnal monkeys. Some populations of Azara’s night monkey are cathemeral, meaning they may be active during both day and night. Lemurs, slow lorises, and tarsiers are also nocturnal primates, but they are not owl monkeys.