humanity absolved

A few weeks ago I posted a story about a mammoth graveyard in Siberia where a village had been built on top without anyone  realising what lay underneath their houses – initially. At the excellent site (lots of pictures( http://siberiantimes.com/science/casestudy/features/f0214-paleothithic-m… … where the idea that some of the carcasses had been butchered because stone tools had been found, ostensibly tools for cutting hides and flesh rather than for killing them, and in a minority as well. It seems the cause of the mammoth deaths will now have to be re-evaluated. One problem is that most of the animals were young – in elephant terms. What killed them?