"No doubt but there is none other beeste comparable to the mightie dragon in awesome power and majestie, and few so worthie of the diligent studies of wise men."
Why does every culture have a dragon? Because they are real. These rare reptiles have many species, most breath fire, but poison is also common. Wings are also optional, as are legs with their being varieties with four, two, and zero legs. All have scales and hair somewhere, but some have skin, and others even have feathers!
However, dragons of all sorts are increasingly becoming rare as human activities threaten them (through the capture and hunting of dragons) and their natural habitat (through the destruction of food webs and ecosystems, deforestation and global warming).