KENNIS AND KENNIS / MSF / SCIENCE PHOTO LIBRARY KENNIS AND KENNIS / MSF / SCIENCE PHOTO LIBRARY
Australopithecus (left) and chimpanzee (right) hands, artwork. Both have opposable thumbs, but the chimpanzee's thumb is less well-developed and not as strong, meaning Australopithecus was better at grasping and manipulating tools and other objects. Australopithecus is a genus of extinct hominin species that formed an early part of the human evolutionary tree, between 2 and 4 million years ago.
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