A wyvern or wivern ( //) is a legendary winged reptilian creature with a dragon's head, wings and often two legs or sometimes none, and a barbed tail. The wyvern is often found in heraldry. There exists a purely sea-dwelling variant, termed the Sea-Wyvern which has a fish tail in place of a barbed dragon's tail. Two of these mythical sea beasts form the supporters of the arms of West Dorset District Council. Wyverns are mentioned in Dante Alighieri's Inferno (Canto XVII) as the component body for the poem's Geryon.