Hi B,
I'll be happy to continue this discussion via PMs, but since this is a sword site, I'll stop my end of the discussion with this.
For anyone else reading this, wikipedia has a useful little article on dragons
http://en.wikipedia.org/wiki/Dragon
This is useful in that it talks about names and symbolism for dragons in a number of societies.
A counter argument for the physical existence of dragons is the idea of "an instinct for dragons," being proposed by an anthropologist. The basic idea is that dragons incorporate aspects of the major predators on primates (including human ancestors): snakes, eagles, and leopards. Here's the wikipedia article.
http://en.wikipedia.org/wiki/An_Instinct_for_Dragons
Again, pm me if you want to talk about cryptozoology.
F