Echidna (mythology)
Echidna ("she viper") was a female monster in 
Greek mythology, usually considered offspring of 
Uranus and 
Gaia, or sometimes 
Ceto.  She had the face of a beautiful woman but the body of a serpent.  When she and her mate, 
Typhon, attacked the 
Olympians, 
Zeus beat them back but allowed Typhon, Echidna and their children to live as a challenge to future heroes.
The offspring of Typhon and Echidna were:
-  Nemean Lion
-  Cerberus
-  Ladon
-  Chimera
-  Sphinx
-  Lernean Hydra