The Chimp Stone Age

So.. when did the Chimpanzee Stone Age "end" and when did Human stone age "begin"? Dont the Chimps still use the stone-hammers? or have they en-masse passed on their grey matter to the homo-sapiens and got done with that?

Chimpanzees may have been using stone "hammers" as long as 4,300 years ago. An international research team, led by archaeologist Julio Mercader of the University of Calgary, Canada, said Monday it had uncovered the hammers, dated to that time, in the West African country Ivory Coast. It would be the earliest known use of tools by chimpanzees.

The hammers were used to crack nuts, a behavior still seen in chimps in that area, the researchers said in a paper in the online edition of Proceedings of the National Academy of Sciences.

The finding may indicate that a "chimpanzee stone age" began in ancient times, the researchers say.

The earliest reports of stone tool use by chimpanzees in this area date to the writings of Portuguese explorers in the 1600s.

The stones were about the size of cantaloupes with patterns of wear indicating use to crack nuts. The rocks would have been too large for human hands, but about right for the larger, stronger hands of chimpanzees, the researchers said.

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