The greatest evidence of this, is all of the cave drawings. Remember that these paintings were done long before the "science" of Archeology. The cavemen didn't have computer modelling to put the bones back together and put flesh on the bones. Here are a few more proofs.
http://www.modomedia.com/quantum/dinosaur-man.html
BTW We still have "cavemen".
Dan
Edited by techristian, : addition clarification
Edited by techristian, : No reason given.