[A. Morgan]

http://www.donsmaps.com/chauvetcave.html

[knarf]

Fascinating

[Tainan]

Quite an interesting site. Thanks.

[Sacajaweau]

One picture said artist showed Bison to be moving by showing extra legs.

Many years ago, I spotted a bull in a field with extra legs. I said to myself....Cool...an optical illusion. The extra legs turned out to be.....

[Fred Nerks]

from your link, Don's Maps:

Beautiful, brilliant!