The birds guard Ares' Temple, currently the Intrepid Sea, Air & Space Museum. Phobos summons them to fight Clarisse La Rue after he and his brother Deimos steal Ares' War Chariot from her. Clarisse fights them outside Goode High School, the school that Percy Jackson attends. Percy sees that she is fighting a losing battle. He leaves class, with the excuse of being sick, to help her, and together they successfully fight off the birds.
They are metallic and as big as ravens and have black feathers that shoot like arrows.
- They have razor sharp feathers that can be used as arrows.
- Their feathers won't kill, but can leave marks and bruises.
- The birds are extremely hard to fight off, as they attack in swarms.
|Species:||Centaur | Cyclopes | Dragon | Drakon | Empousa | Giants | Harpy | Hyperborean Giant | Ichthyocentaur | Karpoi | Laistrygonian Giant | Pegasus | Skolopendra | Stymphalian Birds | Telekhine|
|Friendly Monsters:||Argus | Blackjack | Briares | Chiron | Don | Ella | Festus | Gleeson Hedge | Grover Underwood | Hippocampus | Mellie | Mrs. O'Leary | Ophiotaurus | Peleus | Scipio | Tyson | Tempest|
|Enemy Monsters:||Agrius and Oreius | Arachne | Basilisk | Charybdis and Scylla | Chimera | Chrysaor | Clazmonian Sow | Colchis Bull | Echidna | Euryale | Geryon | Joe Bob | Kampê | Manticore | Medusa | Minotaur | Nemean Lion | Polyphemus | Sphinx | Stheno | Typhon ||
|Neutral Monsters:||Cerberus | Erymanthian Boar | Gray Sisters | Gorgons | Furies | Flesh-Eating Horse | Gryphon | Hippocampus | Siren|