Stymphalian Birds

Stymphalian Birds are a species of monster pigeons.

Greek Mythology
In Greek Mythology one of Hercules' Twelve Labors was to beat the stymphalian birds. He did it by using brass bells to scare them away.

The Series
In The Sea of Monsters stymphalian birds come in the camp during a chariot race. Percy, and Annabeth used Chiron's music so Apollo's cabin could shoot them down.

Powers
Stymphalian birds have sharp beaks that tear through flesh.