Later authors mostly retain these offspring of Echidna and Typhon while adding others. Apollodorus, in addition to naming as their offspring Orthrus, the Chimera (citing Hesiod as his source), the Sphinx, the Caucasian Eagle, Ladon, and probably the Nemean lion (only Typhon is named), also adds the Crommyonian Sow, killed by the hero Theseus (unmentioned by Hesiod). Hyginus in his list of offspring of Echidna (all by Typhon), retains from the above: Cerberus, the Chimera, the Sphinx, the Hydra and Ladon, and adds "Gorgon" (by which Hyginus means the mother of Medusa, whereas Hesiod's three Gorgons, of which Medusa was one, were the daughters of Ceto and Phorcys), the Colchian dragon that guarded the Golden Fleece and Scylla.