wordwalker
Auror
I've mused on this before, that the Quetzalcoatlus was a 500-pound pterasaur, a flying reptile the size of a lion-- so it pretty much is a minor dragon, especially if you add some cunning or a simple breath weapon like spitting poison.
But another answer is in The Flight of Dragons, a book (the movie's very different) that ties together everything from from flying to hoards to Medusa. Peter Dickinson's theory is that dragons could have been living balloons that burned off excess gas in their breath. It explains everything, though it leaves dragons an almost literal "paper tiger" with such weak hides and no real attack except faces evolved to terrify. But a fantasy writer could always add more power, tougher scales, and so on.
It's all about scale. A smaller dragon without thick armor wouldn't need a hero with a runesword (or a Black Arrow) to kill it, just a common bowman with a lot of nerve.
But another answer is in The Flight of Dragons, a book (the movie's very different) that ties together everything from from flying to hoards to Medusa. Peter Dickinson's theory is that dragons could have been living balloons that burned off excess gas in their breath. It explains everything, though it leaves dragons an almost literal "paper tiger" with such weak hides and no real attack except faces evolved to terrify. But a fantasy writer could always add more power, tougher scales, and so on.
It's all about scale. A smaller dragon without thick armor wouldn't need a hero with a runesword (or a Black Arrow) to kill it, just a common bowman with a lot of nerve.