The Lemaen Hydra, another one of Typhon`s daughters, terrorized a spring at the lake of Lerna, near Argos, slaying anyone and anything that approached her lair with her noxious venom, save for a monstrous crab thatwas her companion. She was originally thought to have nine heads, and any neck, if severed,would give rise to two more heads, her ninth head was immortal. She and her crab were slain by Heracles as the second of his Twelve Labors - he cut off her heads and burnt the neck so that she could not regenerate,and crushed her ninth head under a rock, (the crab being accidentally crushed underneath Heracles` heel).