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In Western folklore, dragons are usually portrayed as evil, with the exceptions mainly in Welsh folklore and modern fiction. This is in contrast to Asian dragons, who are traditionally depicted as more benevolent creatures. In the modern period, the European dragon is typically depicted as a huge fire-breathing, scaly and horned lizard-like creature, with (leathery, bat-like) wings, with four legs and a long muscular tail. It is sometimes shown with feathered wings, crests, fiery manes, ivory spikes running down its spine and various exotic colorations. Dragon's blood often has magical properties: for example in the opera Siegfried it let Siegfried understand the language of the Forest Bird. The typical dragon protects a cavern or castle filled with gold and treasure and is often associated with a great hero who tries to slay it. Though a winged creature, the dragon is generally to be found in its underground lair, a cave that identifies it as an ancient creature of earth. Possibly, the dragons of European and Mid Eastern mythology stem from the cult of snakes found in religions throughout the world.
Japanese dragons (日本の竜 Nihon no ryū) are diverse legendary creatures in Japanese mythology and folklore. Japanese dragon myths amalgamate native legends with imported stories about dragons from China, Korea and India. The style of the dragon was heavily influenced by the Chinese dragon. Like these other Asian dragons, most Japanese ones are water deities associated with rainfall and bodies of water, and are typically depicted as large, wingless, serpentine creatures with clawed feet. The modern Japanese language has numerous "dragon" words, including indigenous tatsu from Old Japanese ta-tu, Sino-Japanese ryū or ryō 竜 from Chinese lóng 龍, nāga ナーガ from Sanskrit nāga, and doragon ドラゴン from English "dragon".
From wiki.