He also appears in The Last Olympian when he is playing with Mrs. O'Leary. Cereberus is the son of Echidna and Typhon. Charybdis – One of the two monsters (the other being Scylla) who live on either side of a narrow channel of water (the entrance to the Sea of Monsters). She takes the form of a giant mouth that swallows and releases water, creating whirlpools. she is described by Percy as an "orthodontist's nightmare". Chimera – A three-headed beast that is part lion, part goat, and has a snake-headed tail. It is first seen in the form of a Chihuahua. It confronted Percy atop the St. Louis Arch alongside its mother, Echidna. Overwhelmed by the creature and poisoned by its snake head, Percy was forced to jump into the water below to escape it. It disappeared after Percy dove into the water. Clazmonian Sow – A flying pig that appeared directly after Hyperion was defeated. Percy defeats it with the help of Blackjack, a statue of Hermes, and the New York Public Library's two stone lion statues (that were really automatons). Colchis Bull – Fire-breathing bronze bulls created by Hephaestus with silver horns and ruby eyes. In The Sea of Monsters, some of these bulls attack Camp Half-Blood and are defeated by Tyson. They were later used to make the tracks for the Chariot Race. Dragons – Large reptilian creatures that sometimes have wings. They commonly guard things and are younger than Drakons. Draco Aionius – Some of these monsters attacked Camp Half-Blood while Percy Jackson was on his adventures in The Sea of Monsters. Ladon – A giant dragon who is one of the offspring of Echidna. It defends the Hesperides' apple tree. Ladon poisons Zoë Nightshade in The Titan's Curse. Peleus – A dragon that is now guarding the Golden Fleece which hangs on the tree that Thalia was previously within. He is possibly named after Peleus: Father of Achilles. Python – A giant Earth Dragon who was an old enemy of Apollo. In The Blood of Olympus, Python was revived by Gaea during the Second Gigantomachy and it was mentioned that Python reclaiming Delphi was one of Apollo's many failures. In The Hidden Oracle, Apollo and Meg McCaffrey are in the Labyrinth where they overhear Python talking to Nero about the plans to control all the Oracles. In The Tower of Nero, Apollo manages to destroy