Wyverns are often lumped together with dragons, but their physical features are quite different. Also, they cannot breathe fire. In western folklore, their most treacherous aspect is their poisonous tail stinger. Other accounts claim that wyverns can breathe poison. Wyverns are fierce and violent predators, often associated with war, pestilence, sin, and even Satan.
Wyverns often appeared in medieval heraldry and folklore. They are mentioned in Dante Alighieri's Inferno.