Heracles defeated the Hydra with help from his nephew Iolaus. As Heracles cut off each mortal head, Iolaus cauterized, or burned, the fresh wounds so that new heads could not grow. To help the Hydra an enormous crab also attacked Heracles by biting his foot. When only the Hydra’s immortal head remained, Heracles cut it off and buried it beneath a heavy rock.
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