In Greek mythology, the half-woman, half-snake monster who is the mother of many famous creatures is Echidna.
Echidna is described in Hesiod’s Theogony as a terrifying hybrid: half beautiful maiden and half enormous, speckled serpent. She lived in a cave and was portrayed as ageless and immortal in Hesiod’s account. Later authors and mythographers gave her different genealogies and details, so not every ancient source agrees on her origins.
Her mate was Typhon, the monstrous storm-being who challenged Zeus. Together, they formed one of Greek mythology’s most notorious monster families. Their offspring are commonly said to include Cerberus, the multi-headed guardian of Hades; the Lernaean Hydra; Orthrus, a two-headed watchdog; and the Chimera. Some traditions also connect her lineage with the Sphinx and the Nemean Lion.
Echidna is sometimes mixed up with Scylla, Lamia, or Medusa because all are female monsters in Greek myth. Their identities and stories differ: Medusa is a Gorgon, Scylla is a sea monster, and Lamia is associated with a woman transformed into a child-devouring creature. The modern spiny mammal called an echidna was named after the mythological figure.