as the topid says, let's prove dragons existed, try to write proofs that dragons existed, or if you think they didn't make a good explanation, not only "they never existed" or something like that, remember, make a good argument
PREPARE TO READ!!!
They did, and i'm not just saying it because of animal planet, i'm also saying that they existed because besides what you said about the cultures, they can't be found so easily like to hunt them and extinguish them, also, they had/have plenty of food to feed themselves and their chicks, and talking about chicks,most of the dragons know how to hide their dragon eggs from any possible predator, so, every single egg becomes a chick that becomes a big dragon, the only thing that can extinguish them is the hydra dragon, that eats other dragons chicks, but there aren't so many in the world (for people who don't know what a hydra dragon is, is the one with a lot of heads, like in the mummy 3) so, there is no such a reason by the wich they could have died, and there's plenty of proof they existed, and also, think, if pterodactyls(i know i spelled it wrong) existed, why dragons couldn't existed? also, i think that if there was the whole thing of the metheoryte (i'm bad spelling prehistoric things) i think they survived it, because they are very smart (they are smart everywhere you look for dragons information... if i'm wrong in that sorry) like to survive it, also, if the crocodyle survived, why the dragon wouldn't survive as well if both of them are from the reptile section scientifically.
and about their actual existance... they can actually be living in the world, but since the human keeps with eliminating free natural space, as animal keep dying and being taken apart from their natural habitat, that could be happening to the dragons, and they could be extinguishing because their source of food is decreasing, just like the regular animals we know, and besides they are being taken off their natural habitat and they can fly, they would need to fly a lot to get into a new safe area apart of humans, they also have to face the global warming (tough they can survive that as well... i guess) and the lake dragons (i'm no talking about the monster of the lakes) have to face the petroleum we humans "accidentaly" drop into the sea; and the frost dragon that migrates every 6 months from pole to pole to follow the night in the poles, they also have to face the smog we humans have created, and the trip from pole to ple is very long, so, flying so much with smog, should be very tiring and very bad to their lungs, and we don't their bodies/skeletons because they fall into the sea (remember actually, not in the past) that could be a reason they are extinguishing, if they live in the actuality...
and as an extra fact, i would like to say that their bones were light-weight, so they could fly, and since they were so light, when dragons died, their bones decomposed themselves because they were weak when they got dead
whell i tink that -proves their existance/existence in the world...