Nearly every culture has myths about something called a "dragon", despite the fact none of them can agree on exactly what dragons are.
How big are they? What do they look like? How many heads do they have? Do they breathe fire? Or ice? Do they fly (and if so, with or without wings)? How many legs do they have? Are they dumb as planks, or superintelligent? Are they low scaly pests, or ultra-rare Uber-serpents ancient and powerful as the Earth itself? Are they benevolent? Malevolent or even outright demonic? Are they divine entities or spirits, or just really cool animals? They could even be aliens in some works of fiction.
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