Estimates of the amount of identical genetic material (DNA) in chimpanzees and humans range from 94.6% to 99.4%. This marked similarity, and additional evidence, have led primatologists to suggest that the taxonomy of the apes should include three groups: hylobatidae (gibbons and siamangs); pongidae (orangutangs); and hominidae (gorillas, chimpanzees, and humans). Apes are classified in the phylum Chordata, subphylum Vertebrata, class Mammalia, order Primates.
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