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A wyvern (or wivern) (IPA: waɪvərn) is a legendary winged reptilian creature often found in medieval heraldry. Its usual blazon is statant (standing). Its origin is in Europe.
The name "wyvern" derived from the Saxon word Wivere, which means "serpent". The French wyvern is known as the Vouivre. Both words are etymologically related to viper.
The wyvern can be regarded as a type of or similar to a dragon. Depictions often include two legs and two wings. Sometimes there are eagle's claws on the wingtips. The rest of its appearance can vary, such as appearing with a tail spade or with a serpent-like tail.
Variants of the wyvern include the sea-wyvern, which has a fish-like tail. The wyvern has a similar appearance to another mythical creature, the cockatrice.

Heraldry and symbolism
Some cryptozoologists have theorized that wyverns are evidence of surviving pterosaurs, a large flying reptile thought to have gone extinct around 65 million years ago. There is no evidence to prove these theories or sightings.