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Dragons are possiable, but fire breathing is not.
They would probably have very large wings and only be able to fly for short periods of time. This would be practical as they could quickly grab their food and fly a few hundred meters before eating it away for other potential predators (or predators allies trying to stop the dragon).
The basic body build of a dragon would probably be the same as a large lizard and so overall not move fast unless it needs to. Also after finding food, it will probably sleep for a while to digest it (like in some kind of cave or shelter).
Although they are agressive (as all living creatures, even humans are as it is a normal survival trait), they probably would form friendships, partnerships or families with other dragons. This can be backed with fact as there are species of lizards which display these kinds of behaviour.
Also as dragons are a lot bigger than normal lizards, they probably would have bigger brains (matching near the size of a human brain if the dragon is big enough). This would mean they probably would have some kind of ability to comunicate with other dragons and atleast form their own traditions and other simplisitc behaviours (like elephants in a way). Ofcourse they probably would not develop tools, farming or other technological breakthroughs as they do not need them to survive (humans only developed them to make surviving easier but if you are a dominant prediator thre is no reason to) but this does not mean that they would not decorate them selves with "jewlery" (maybe not in the form we know it).
The reason dragons would not exist in that form (atleast on earth with out the creationlist approch) is that it would not be the most efective way to evolve in evolutionary terms and also they can not evolve now as they would be stopped by mamals which would obviously out do them evolutionary wise and humans which would use them as target practice for their latest anti tank sub machinegun.
As dragon are reptiles, dominant preditors and constantly grow throughout their lives, they would probable (if they are lucky) be able to live to well over 200 years of age.
Dragons probably would hear a lot worse than us but would definatly see colours at a lot higher depth and number than us as well as be able to smell more accuratly than us (via the way reptiles sense smells like snakes). This would mean they probably could easilly make out a rabbit on a hill many kilometers away which humans even struggle to see with binoculars.
Remember that just because they are not human does not mean they would live shorter than us. Afterall we are mamals and mamals tend to have very short maximum life expectancies.
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