At Chauvet, Fosse and his colleagues have discovered bones from 14 different species, including rodents, birds and reptiles, but mostly there are bear bones: 3,700 of them. (They have yet to find human bones.) The bones are scattered all around the cave and there is a theory among some of the Chauvet experts that humans might have used the bones to mark territory or, much like Hansel and Gretel ma