Wyvern

Wyerns are large winged reptiles with boney, barbed tails. They inhabit the Cloakwood in Baldur's Gate and are sometimes confused with dragons because of their similar appearance and behavior. However, they do not breath fire and are much smaller than dragons. Wyverns have the ability to poison party members and deal a lot of melee damage though not as much as Greater Wyverns.

Strategy
It may be helpful to stock up on Antidotes before facing a Wyvern.