The Symphalian Birds

After returning from the stables, Hercules was ordered to drive away and enormous flock of birds which gathered at the lake near the town of Stymphalos.

      Unsure of how to drive the birds away, Athena came to Hercules's aid. She gave him a pair of bronze Krotala (similar to castanets) that have been crafted by Hephaistos. 

      Hercules climbed the nearby mountain and scared the birds into flight. Then he shot them all with a bow, or slingshot.