The discovery that chimps were living in semi-arid conditions as well as in the jungle seems to blow apart the simplistic idea that it was the shift to savannah that led to humans walking upright. The teeth are around 500,000 years old,
Bipedalism occured at least 4 million years ago. It's a simplistic idea to suggest that a chimp passing through 3 1/2 million years later somehow blows away the "shift to savannah" hypothesis!
29 posted on 08/31/2005 12:31:05 PM PDT by shuckmaster