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(New World monkeys), a family of platyrrhine monkeys. The body length ranges from 24 to 91 cm. The tail is long and, in many species, prehensile. The fur is thick and varies in color. The teeth number 36. The family comprises 11 genera, including Aotus (douroucoulis), Alouatta (howling monkeys), Cebus (capuchin monkeys), Saimiri (squirrel monkeys), and Ateles (spider monkeys); there are 29 species. The Cebidae are distributed in Central and South America. They are arboreal, diurnal (except Aotus), and gregarious. The diet consists of plants, insects, birds, and bird eggs.