Wyvern

A wyvern (/ˈwaɪvərn/ WY-vərn, sometimes spelled wivern) is a legendary biped creature with a dragon's head and wings, a reptilian body, two legs, and a tail often ending in a diamond- or arrow-shaped tip. A sea-dwelling variant dubbed the sea-wyvern has a fishtail in place of a barbed dragon's tail.

The wyvern in its various forms is important to heraldry, frequently appearing as a mascot of schools and athletic teams (chiefly in the United States, United Kingdom, and Canada). It is a popular creature in European and British literature, video games, and modern fantasy. The wyvern in heraldry and folklore is rarely fire-breathing like the four-legged dragon. Sometimes modern fantasy book and media authors have wyverns that are frost-breathing or poison-breathing instead of fire-breathing.