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Okay, yes. But also: dragons originated from pre-radiation Africa. Every culture has it because they all had distant contact with that one.

Iirc, it's thought that the original dragon was a flying feathered serpent and also a storm god.

Edit: sorry I was falling asleep and high while writing this.

Edit2: okay, I'm sober and awake now, so I guess I should revise my statement a bit. It is my amateur understanding, as a nerd who is not in any way a scholar of mythology, that there is a theory for the origin of mythological creatures known as dragons. I cannot attest to how well-founded this model is, but I believe it goes as such: a human culture, in Africa, existed prior to homosapiens leaving the continent. This culture is believed to have had storm deity that was a feathered serpent, and that deity was the basis of all dragon myths held by cultures that left the continent and the descendants thereof.