Dictionary of Human Evolution and Biology

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Cacajao Lesson, 1840

Platyrrhine genus to which the uakari monkeys belong; two to three species recognized; found in upper Amazon basin of southern Venezuela, eastern Peru and eastern Colombia, where they prefer the canopy and middle levels of flooded primary forests. Diurnal; arboreal quadrupeds that rarely descend to the ground; the only short-tailed platyrrhines (1/3 of body length or less). These are the largest pithecines, ranging in body mass from 2.8 to 4.1 kg, with males larger than females; species comparable in size. Natural history poorly known. Dental formula:; appear to be frugivorous and granivorous. Face bare; adult males have well-developed temporalis muscle that forms a bulge on the head. Live in troops, usually 20-30 individuals but sometimes up to 100 mixed-sex individuals; these troops undergo fission into smaller foraging groups; believed to be polygamous and fission-fusion society.

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