''Lucy's Baby'' Adds to Early-Human Record

Our Ancient Ancestors
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The curve of a reconstructed A. afarensis spine (left) closely resembles that of a silhouetted human spine (center), supporting the belief that the ancient species walked upright on two legs.

The shadow of a chimpanzee spine (right) displays the same forward inclination of early human species that likely walked on all fours.

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Photograph by Kenneth Garrett/National Geographic
 
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