In Angim or "Ninurta's return to Nippur", the storm god describes one of his weapons as "the seven-mouthed muš-mah serpent" (line 138), reminiscent of the Greek myth of Heracles and the seven headed Lernaean Hydra he slew in the second of his Twelve labours. An engraved shell of the Early Dynastic period shows Ninğirsu slaying the seven-headed mušmaḫḫū.
