Seriously though, there are numerous extant creatures that, given a game of telephone played across continents, could account for dragons--not least of all dragons, as in komodo. Familiarity with snakes + valley-dweller's first view of a river from afar = dragons. Dinosaurs need not be involved, and really don't bear that close a resemblance to dragons of myth, which tend to be impossibly large serpents (i.e. exaggerated fear/archetypefication of snakes), not raptors or appatosaurs. The Western dragon, aggressive, dominant and maiden-ravaging, is basically a big scaly penis. Any connection to dinosaurs is a stretch well after the fact.