Photo: Ancient Camels Butchered in Colorado, Stone Tools Show?

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In May 2008 a landscaping crew accidentally happened upon a stash of 83 stone tools (above), including well-crafted knives, small blades, and axes.

About 13,000 years ago, humans in the Clovis culture may have used the tools to butcher American camels in what is now the city of Boulder, a February 2009 analysis of blood residue suggests.

Image courtesy of Professor Matthew Bennett, Bournemouth University

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