Here Be Dragons

dragon
A dragon is a magical legendary creature that appears in the folklore of multiple cultures worldwide. Beliefs about dragons vary considerably through regions, but dragons in Western cultures since the High Middle Ages have often been depicted as winged, horned, and capable of breathing fire. Dragons in Eastern cultures are usually depicted as wingless, four-legged, serpentine creatures with above-average intelligence. Commonalities between dragons' traits are often a hybridization of reptilian, mammalian, and avian features.
Famous prototypical draconic creatures include the mušḫuššu of ancient Mesopotamia; Apep in Egyptian mythology; Vṛtra in the Rigveda; the Leviathan in the Hebrew Bible; Grand'Goule in the Poitou region in France; Python, Ladon, wyvern and the Lernaean Hydra in Greek mythology; Kulshedra in Albanian mythology; Unhcegila in Lakota mythology; Quetzalcoatl in Aztec culture; Jörmungandr, Níðhöggr, and Fafnir in Norse mythology; the dragon from Beowulf; and aži and az in ancient Persian mythology, closely related to another mythological figure, called Aži Dahaka or Zahhak. Nonetheless, scholars dispute where the idea of a dragon originates from,and a wide variety of hypotheses have been proposed.
Draconic creatures appear in virtually all cultures around the globe, and the earliest attested reports of draconic creatures resemble giant snakes. Draconic creatures are first described in the mythologies of the ancient Near East and appear in ancient Mesopotamian art and literature. Stories about storm gods slaying giant serpents occur throughout nearly all Near Eastern and Indo-European mythologies.
Japanese dragon myths amalgamate native legends with imported stories about dragons from China. Like some other dragons, most Japanese dragons are water deities associated with rainfall and bodies of water, and are typically depicted as large, wingless, serpentine creatures with clawed feet. Gould writes (1896:248),[78] the Japanese dragon is "invariably figured as possessing three claws". A story about the samurai Minamoto no Mitsunaka tells that, while he was hunting in his own territory of Settsu, he dreamt under a tree and had a dream... read the rest on the dragon wikipedia