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Catarrhini is the unranked group of the Primates, one of the three major divisions of the suborder Haplorhini. It contains the family Cercopithecidae ( Old World monkeys), the gibbons or lesser apes ( Hylobatidae) and the Hominidae (hominids), which include humans, chimpanzees, gorillaGorilla gorilla Gorilla beringei The Gorilla the largest of the primates, is a ground-dwelling herbivore that inhabits the forests of central Africa. Gorillas move about by knuckle-walking. Males range in height from 1. 75 m, and in weight from 140 kg tos, bonoboThe Bonobo Pan paniscus , sometimes called the Pygmy Chimpanzee is one of the two species comprising the genus Pan both members of that genus are technically "chimpanzees", though the term is frequently used to refer only to the other member of the genus,s and orangutanPongo pygmaeus Pongo abelii The Orangutan (also spelt Orang Utan Orang-utan sometimes incorrectly orangutang is a great ape with long arms and reddish, sometimes brown, hair native to Malaysia and Indonesia. Orangutan is derived from the Malay Orang Hutan. Some count the orangutanPongo pygmaeus Pongo abelii The Orangutan (also spelt Orang Utan Orang-utan sometimes incorrectly orangutang is a great ape with long arms and reddish, sometimes brown, hair native to Malaysia and Indonesia. Orangutan is derived from the Malay Orang Hutan as its own family, called Pongidae. Older authors described humans and their most close extinct relatives/ancestors as family on its own and placed the great apes in the family Pongidae. The other haplorhines are the prosimian tarsiers, which were formerly classified as strepsirhines, and the Platyrrhini ( New World monkeys), which live in South America.

Catarrhini means narrow nose, and the term describes their narrow, downward pointing nostrils. Unlike the platyrrhini, they are generally diurnal and their tails (if they have tails at all) are not prehensile. They have flat fingernails.

Their dental formula is

Most species show considerable sexual dimorphism and do not form a pair bond . Most but not all species live in social groups. They are all native to Africa and Asia. (except for us humans of course)