Cockatrice

The Cockatrice resembles a large rooster, with dragon's wings and a serpent's tail. It's magic powers include a deadly stare that can kill people or turn them to stone. It can only be killed if its stare is reflected back at it from a polished surface, such as a mirror, or if it hears a rooster crow. The weasel, the Cockatrice's archenemy, is the only animal that can survive its gaze.