any of various omnivorous mammals of the order Primates, comprising the three suborders Anthropoidea (humans, great apes, gibbons, Old World monkeys, and New World monkeys), Prosimii (lemurs, loris, and their allies), and Tarsioidea (tarsiers), especially distinguished by the use of hands, varied locomotion, and by complex flexible behavior involving a high level of social interaction and cultural adaptability.