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Northern night monkeys—also known as northern owl monkeys, three-striped night monkeys, or douroucoulis—are found north of the Amazon River, primarily between southern Venezuela and north-central Brazil.
Today, there are two groups of night monkeys: the gray-necked owl monkeys, which include Spix’s night monkey and live north of the Amazon River, and the red-necked night monkeys, which live south of the Amazon River.
Night monkeys are the only truly nocturnal monkeys with the exception of some cathemeral populations of Azara's night monkey, who have irregular bursts of activity during day and night. They have a varied repertoire of vocalisations and live in small family groups of a mated pair and their immature offspring.
The Aotidae family, commonly known as night monkeys or owl monkeys, holds a special place in the primate world as the only truly nocturnal New World monkeys. For a broader look at different types of monkeys, explore our monkey guide.
Night monkeys (Aotus), also known as owl monkeys, are New World primates found across Central and South America, ranging from Panama to northern Argentina. Belonging to the family Aotidae, they are characterized by their nocturnal lifestyle and distinctive owl-like appearance.
Nov 18, 2022 · Ten night monkeys (Aotus lemurinus, five males and five females, age = 23.8 ± 6.8 y.o, body weight = 1.08 ± 0.08 kg) were used in this study. All animals were provided by the Center for the Evolutionary Origins of Human Behavior (former Primate Research Institute), Kyoto University (Inuyama, Japan).
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There are eight species of night monkeys, also commonly called douroucoulis or owl monkeys, found from Panama to Peru, Bolivia, and northeastern Argentina. Douroucoulis are the only nocturnal monkeys in the New World. They are small monkeys found exclusively in forests.
