[Lurking Libertarian]

All cultures have dragon legends. I don't know a single one that doesn't include the concept of a dragon somewhere.

Probably because they found dinosaur bones.

[Redcloak]

Fossils as the source for dragon stories makes sense only if all of these cultures are finding specimens that are largely intact. A few, large, bone-shaped rocks scattered about the countryside aren't likely to inspire such a universal image.