Echidna (mythology) eyes" and she bore "fierce offspring". First there was Orthrus, the two-headed dog who guarded the Cattle of Geryon, second Cerberus, the multiheaded dog who guarded the gates of Hades, and third the Lernaean Hydra, the many-headed serpent who, when one of its heads was cut off, grew two more. The "Theogony" mentions a second ambiguous “she” as the mother of the Chimera (a fire-breathing beast that was part lion, part goat, and had a snake-headed tail) which may refer to Echidna, though possibly the Hydra or even Ceto was meant instead. Hesiod next names two more descendants of Echidna,
The Seven-headed Serpent The sword was the only one that could kill the serpent; it would regrow a new blade for every head, if it broke. He was to stuff the bells with cotton and then wound it in the tail. It would put its heads up, one at a time, and he should cut each one off. He obeyed her and killed it. The animals of the island chased him, but be escaped. The Seven-headed Serpent "The Seven-headed Serpent" is a Greek fairy tale collected, as "Die Siebenkopfige Schlange," in Bernhard Schmidt's "Griechische Mahrchen". Andrew Lang included it in "The Yellow Fairy