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I'd say NetherSpirit pretty much got it - the difference is that cryptozoology is scientific and mythology is religious - the two do sometimes overlap, but myths and legends are different from modern sightings.
I'm now not following at all. Every single one of your references about dragons are over four hundred years old in age. Quetzalcoatl, the feathered serpent is the Aztec god of fertility. The Chinese Ocean Branch heads and the rain god are worshipped and taught in mythos. Saint George's dragon is a misconstrued myth from thousands of years ago.
Are you using mythos or ancient sightings where witnesses happened to throw thousands upon thousands of their hours to worshipping these mysterious sightings.
Would UFOs count? They're sighted often.
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On the other hand, humans aren't animals.
Wait. What? What are you saying are animals? I mean, wikipedia might be wrong, but it claims explicitly that we very much are. Why can't we discuss werewolf magick and vampires while we're at it? Is it because we don't have vampire sightings anymore, or that they're slowly 'coming out of the coffin' more and more?