The five major types of social organizations are found among primates: multi-male group, family group, harem group, all male group and unstable group. The order Primates containing over 200 species is classified into two suborders: Prosimii (lower primates) and Anthropoidea (higher primates). Prosimians or lower primates are less man-like and they retain many primitive characteristics. Lower primates include true lemurs, dwarf and mouse lemurs, indris, sifakas, aye-aye, bush babies, pottos, lorises and tarsiers. They live chiefly in forests. The members belonging to the suborder Anthropoidea include capuchin-like monkeys, marmosets, tamarins, Old World monkeys, apes and men.