Dragons are rather a big myth. Myths are usually based somewhat on fact.
There are many today that state that dragons could not have existed that could breathe fire, because breathing fire isn't possible. However, there is a beetle in South America that does indeed spit fire and burn its victims. It's a highly volatile acid that it ignites as it leaves its mouth by clicking together a mandible that causes a spark. Watch out!
They say dragons could not have flown, but look at the Pterodactyl.
Just saying. Just because we don't understand something, doesn't mean it does or doesn't exist.
07-23-2015 01:15 PM