Monkeys are a kind of primate.
Monkeys are generally small to mid-size primates that usually have long tails. The largest species is the mandrill of Africa and the smallest is the pygmy marmoset of South America. Monkeys are divided into two groups of species: the old world, native to South and Central America and the Old World which live in Africa and Asia.
Monkeys make a number of appearances in the series, as well as being mentioned in a number of episodes.