[Picture: Hercules fighting the Hydra] The fifth task was a curious one. Augeas, king of Elis, had immense herds, and kept his stables and cow-houses in a frightful state of filth, and Eurystheus, hoping either to disgust Hercules or kill him by the unwholesomeness of the work, sent him to clean them.  Hercules, without telling Augeas it was his appointed task, offered to do it if he were repaid the tenth of the herds, and received the promise on oath.  Then he dug a canal, and turned the water of two rivers into the stables, so as effectually to cleanse them; but when Augeas heard it was his task, he tried to cheat him of the payment, and on the other hand Eurystheus said, as he had been rewarded, it could not count as one of his labours, and ordered him off to clear the woods near Lake Stymphalis of some horrible birds, with brazen beaks and claws, and ready-made arrows for feathers, which ate human flesh.  To get them to rise out of the forest was his first difficulty, but Pallas lent him a brazen clapper, which made them take to their wings; then he shot them with his poisoned arrows, killed many, and drove the rest away.