Large rubbing animals

At wikipedia.org you can learn one thing or another.

Today, or rather tonight, or maybe this morning (it's 5.46am, you tell me...), I learnt that the Sonoma Coast state beach in California have rocks which apparently still bear the evidence of mommoths rubbing themselves here over 40,000 years ago.

Rubbing... how good do you need to rub yourself in order for the evidence to remain 40,000 years?


Apparently, the mammoths were alive already 1.6 million years ago, but became extinct 3,500 years ago. In the current halloween spirit, I will of course post skeleton pictures. The mammoths though, are, as I understand it, believed to have had some flesh and fur too. Some fur that they enjoyed rubbing against rocks...