Feather-Shooting Bird

Feather-shooting birds (Αστραπή-Σκοποβολή πουλί in Ancient Greek) are metallic birds that can shoot their feathers like arrows or throwing knives.

The Stolen Chariot
The birds guard Ares' Temple. Phobos summons them to fight Clarisse after he and his brother Deimos steal Ares' War Chariot from her. Clarisse fights them outside Goode High School, the school that Percy attends. Percy later sees that she is fighting a losing battle. He leaves class (with the excuse of being sick) to help her, and they successfully fight off the birds.

Appearance
They are as big as ravens and have black feathers.

Abilities

 * They have razor sharp feathers that can be used as arrows.
 * Their feathers won't kill, but can leave marks and bruises.
 * The birds can be extremely hard to fight off, as they attack in swarms.