"A kind of flying serpentine dragon with bat wings, two avian hind legs, with eagle talons, and a long barbed tail. Basically, it resembles a Pterosaur, such as ramphohynchus. One variant is the Sea-Wyvern, which has the tail of a fish. Wyverns have been described as the largest form of dragon, able to prey on such huge creatures as elephants and rhinos.

In heraldry, the wyvern symbolizes war, pestilence, envy, and viciousness. The default coloration of a heraldic wyvern is green with a red chest, belly, and under-wings."

~Source: Literature- Zell Ravenheart, Oberon, "A Wizards Bestiary/by Oberon Zell-Ravenheart and Ash "LeopardDancer" DeKirk" New Page Books, 2007