Dictionary of Human Evolution and Biology

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Chiropotes Lesson, 1840

Platyrrhine genus to which the bearded sakis belong; two species. Found in mature rain forests of central and northwestern Brazil and the Guianas, where they occupy the upper canopy. Diurnal; arboreal quadrupeds without a prehensile tail. Range in body mass from 2 to 4 kg; slight sexual dimorphism in body size; males have well-developed temporalis muscles, which form bulge on head. Pink face, long rounded beard that emanates from cheeks and chin. Dental formula: 2.1.3.3; frugivorous and granivorous. Live in mixedsex troops of up to 25 individuals.

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