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A primary distinction between red-necked and gray-necked night monkeys is spatial distribution. Gray-necked night monkeys (Aotus lemurinus group) are found north of the Amazon River, while the red-necked group (Aotus azare group) are localized south of the Amazon River. [11]
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.
First described in 1823 by German naturalist Johann Baptist von Spix, Spix’s night monkey (Aotus vociferans)—also known as the Colombian gray night monkey, noisy night monkey, or Spix’s owl monkey—is found north of the Amazon River in Brazil, Colombia, Ecuador, and Peru. Its range is limited by geographical barriers: the…
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.
The Colombian night monkey is a small Latin American (Platyrrhini) species from the family Aotidae and genus Aotus. Prior to 1983, all night monkeys were classified as one or two species (Aotus lemurinus and Aotus azarae). At that time, chromosome variations led to the proposal of nine species.
Night monkeys occur in a wide variety of forested habitats, from tropical lowland forests to cloud forests and in gallery forests, deciduous and semi-deciduous forests, dry forests, and mangrove swamps. They are found in primary, secondary, and remnant forests. (Cawthon Lang and Fernandez-Duque, 2005; Martin, 2004; Nowak, 1991)
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The three-striped night monkey (Aotus trivirgatus), also known as northern night monkey or northern owl monkey, is one of several species of owl monkeys currently recognised. It is found in Venezuela and north-central Brazil. Show More