Different legends place her variously as the daughter of Chrysaor and Callirrhoe, Gaia and Tartarus, or Phorcys and Ceto.  Whatever her own lineage, she certainly got around.  According to one story, she even got lucky with Heracles, giving birth to three of his children:  Agathyrsus, Gelonus, and Scytha.  By her own son Orthus she gave birth to the Sphinx and the Nemean Lion, and by Orthus' father, Typhon, the Chimaera, the Hydra, and Cerberus. For 10 points, who was this monstrous mother of Greek myth--half-woman and half-serpent--who shares her name with a modern monotreme?
Different legends place her variously as the daughter of Chrysaor and Callirrhoe, Gaia and Tartarus, or Phorcys and Ceto.  Whatever her own lineage, she certainly got around.  According to one story, she even got lucky with Heracles, giving birth to three of his children:  Agathyrsus, Gelonus, and Scytha.  By her own son Orthus she gave birth to the Sphinx and the Nemean Lion, and by Orthus' father, Typhon, the Chimaera, the Hydra, and Cerberus. For 10 points, who was this monstrous mother of Greek myth--half-woman and half-serpent--who shares her name with a modern monotreme?
Different legends place her variously as the daughter of Chrysaor and Callirrhoe, Gaia and Tartarus, or Phorcys and Ceto.  
Echidna