Apes are known for their exceptional resemblance to humans. Great apes are those animals that have a close similarity to humans. There are four of them: the orangutan, gorilla, chimpanzee and the pygmy chimpanzee.
Great apes are the largest of the order of primates. Another category, the lesser apes are one step away from the great apes in their likeness to humans. These apes are gibbons and siamangs. All these animals have fingers and thumbs and can use their hands as humans do. They all belong to the family hominidae.
There are two categories of gorillas; the western and the eastern gorilla. Orangutan too has species: the Bornean orangutan and the Sumatran orangutan. Among the chimpanzees are the common chimpanzees and the pygmy chimpanzees.
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