What's your stance on bringing back extinct species?

[Anomalocaris]

Dragons don't defy the laws of physics?

Absolutely not. The characteristics which make dragons dragons are found in other species (extant and extinct). There’s no real bar to these being combined in a single beastie.

Boru

The beauty of a fantasy creature impossible to exist is it conveniently didn’t exist, so there is conveniently no evidence to provide any definitive set of characteristics for it, like there would be with a real creature that did exist, so whose defining traits leaves evidence and be identified and itemized.

So whether dragon’s characteristics are all feasible in a real organism, as demonstrated by their all being found in some other creatures, depends entirely on what your personal opinions of entire body of necessary characteristics required to qualify something to be a dragon.     If some of the necessary characteristics are it would be big and weigh hundred of pounds at least and it can fly under the power of muscles similar to those found in living organisms, then that would be a physics violation right there.    being able to generate in its gut or mouth fire hotter than the fire used to smelt ordinary metal and having its digestive tract survive the ordeal ?   both would be quite unparalleled in living or dead organisms.