Echidna

Echidna was a monster, part woman and part snake. She was the daughter of Phorcys and Ceto, or perhaps of Tartarus and Gaea. Echidna was the mother of many monstrous offspring such as Cerberus, Chimaera, Orthus, the Hydra, Nemean Lion, Sphinx, Caucasian Eagle, Crommyonian Sow and vultures.Though Echidna never grew old, she was not immortal.