RICHARD BIZLEY / SCIENCE PHOTO LIBRARY RICHARD BIZLEY / SCIENCE PHOTO LIBRARY
Human evolution. Artwork showing a snapshot of the evolution of humans from earlier forms of life. At far left is the shrew-like mammal, Purgatorius (65 million years ago, mya), that is thought to have evolved into a lemur-like animal (second from left, 45 mya). Following this is a succession of four pre-human primates: Aegyptopithecus (35 mya), Proconsul (20 mya), Australopithecus afarensis (4 mya), and Homo erectus (1 mya). Finally, modern humans, Homo sapiens (far right), appeared around 400 thousand years ago.
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