Physical characteristics

The body is slender and covered with dense fine hair, varying in color from gray to brown dorsally and from yellow to

A pair of three-striped night monkeys (Aotus trivirgatus). (Photo by © Michael J. Doolittle/The Image Works. Reproduced by permission.)

The three-striped night monkey (Aotus trivirgatus) has large eyes to collect a lot of light. A reflective coating behind their eyes reflects the light back out. Their color cones can "read" light both coming in, and after reflection. (Photo by © Michael J. Doolittle/The Image Works. Reproduced by permission.)

The Azari's night monkey (Aotus azarai) does not have a prehensile tail. (Photo by Aníbal Parera. Reproduced by permission.)

Azari's night monkey (Aotus azarai). (Photo by Peter Oxford/Naturepl.com. Reproduced by permission.)

The three-striped night monkey (Aotus trivirgatus) is monogamous. (Photo by © Kevin Schafer/Corbis. Reproduced by permission.)

orange ventrally. Conspicuous white or pale gray patches surround the eyes and the mouth, and the white areas above the eyes are emphasized to varying extents by three spurs of dark fur in the midline and on either side of the crown. The head is rounded and the muzzle does not protrude. The tail, which is not prehensile, is typically longer than the body and densely furred. Average head and body length is 13.5 in (34 cm); average tail length is 15 in (37 cm). There is no sexual dimorphism in size and the average body mass for both sexes is approximately 2 lb (910 g).

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