Three ancestor species coexisted by a few million years ago: 5' (1.5m) tall "australopithecus robustus" appeared about 2.5 million years ago having brains 1/3 of human size, 4' (1.2m) tall "australopithecus africanus" lived 2-3 million years ago also having brains 1/3 of human size, and 5' (1.5m) tall Homo habilus ("handy man", "skillful person") existed having brains half human size.
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