Thus, many tree-dwelling mammals came down from woods to enter the savannahs. They began to live in in the savannahs, but sometimes returned to the forests to obtain food. During the glacial ages, when the savannah expanded, large savannah-dwelling mammals evolved, such as elephants and giraffes. It is thought that the characteristics suitable for the ground life of African apes and human ancestors also evolved during this period.
■References (Books, papers, Web articles, etc.)
LE GENOU DE LUCY Yves Coppens Odile Jacob (March 30, 2000)
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