This one was requested by @EvilKitten127  I hope that you enjoy it:)
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Stymphalian birds

Origin: Greek mythology

Summary and or Explanation: The Stymphalian birds (Greek: Στυμφαλίδες ὄρνιθες, Stymphalídes órnithes) are a group of birds in Greek mythology. The birds are in a swamp in Stymphalia.

The Stymphalian Birds are man-eating birds with beaks of bronze, sharp metallic feathers they could launch at their victims, and poisonous dung. They were pets of Ares, the god of war. They migrated to a marsh in Arcadia to escape a pack of wolves. There they bred quickly and swarmed over the countryside, destroying crops, fruit trees, and townspeople.

The Stymphalian birds were defeated by the hero Heracles(Hercules) in his Sixth Labour for Eurystheus. Heracles could not go into the marsh to reach the nests of the birds, as the ground would not support his weight. Athena, noticing the hero's plight, gave Heracles a rattle which Hephaestus had made especially for the occasion. Heracles shook the rattle and frightened the birds into the air. Heracles then shot many of them with arrows tipped with poisonous blood from the slain Hydra. The rest flew far away, never to plague Arcadia again. Heracles brought some of the slain birds to Eurystheus as proof of his success.

The surviving birds made a new home on an island in the Euxine Sea. The Argonauts later encountered them there.

(I played an otome game where Hercules was an awful person who actually ran around stealing the aura out of innocent monsters. A lot of the really deep stuff came from Wikipedia while I do know a lot about mythology I don't know everything.)