Pegasus - the winged horse, a favorite of the Muses.
According to one version, was born gorgon Medusa by Poseidon. He jumped out of the trunk of Medusa with his brother warrior chrysaor after Perseus cut off her head. According to another version, it spawned got on the ground blood of Medusa. Pegasus hit hooves on the ground could knock sources.
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From @wowpeach