PATRICK LANDMANN / SCIENCE PHOTO LIBRARY PATRICK LANDMANN / SCIENCE PHOTO LIBRARY
Skull cast of a Paranthropus boisei (Australopithecus boisei). P. boisei is an extinct species of hominid that lived in East Africa during the Pleistocene epoch from about 2.4 until about 1.4 million years ago. It forms part of the human evolutionary tree; although a divergent branch to that which led to modern humans.
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