THis is just theories based on depictions of dragons, which are common in the mythology of almost every known historical culture. No one alive now knows, or at least is willing to explain, where the idea of dragons came from, but it's assumed to have been from fossil records about whioch stories wrere told, then spread and changed (i personally don;t like this theory, but it's the best I've heard.) As for the fossil footprints, at least two of those, and probably several more, are both proven and admitted to be hoaxes, so I find that decreases the likelihood that the rest of the site is more factual than, say, wikipedia a couple of years ago. Probably less.