A primate is any member of the biological order Primates, the group that contains all the species commonly related to the lemurs, monkeys, and apes, with the latter category including humans.
Primates are found all over the world.
Non-human primates occur mostly in Central and South America, Africa, and southern Asia.
A few species exist as far north in the Americas as southern Mexico, and as far north in Asia as northern Japan.
The Primates order is divided informally into three main groupings: prosimians, monkeys of the New World, and monkeys and apes of the Old World.
All primates have five fingers (pentadactyly), a generalized dental pattern, and a primitive (unspecialized) body plan.
Another distinguishing feature of primates is fingernails.
Opposing thumbs are also a characteristic primate feature, but are not limited to this order; opossums, for example, also have opposing thumbs.
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