from a trawler's net after being fetched by the Hippocampi. Bessie was supposedly the creature that Artemis was hunting because it could destroy Olympus. She/He appears in The Titan's Curse and The Last Olympian. Orthrus – A two-headed dog owned by Geryon and brother to Cerberus. Pegasus – Winged horses that are named after the original mount of Bellerophon that was born from the blood of Medusa. Pegasus - The original Pegasus who is the immortal father of the species. He is stated to have not been seen in person for centuries, but Pegasus comes to Reyna, Nico and Coach Hedge's aid in The Blood of Olympus, leading eight other Pegasus to help transport the Athena Parthenos. He eventually departs when the group arrives at Long Island Sound, but reveals that he came to honor Reyna's close relationship with Scipio for which Pegasus declares her Horse Friend, a high honor. Blackjack – A black Pegasus and Percy's loyal friend. He is first introduced in The Sea of Monsters on the Princess Andromeda where Percy indirectly rescued him from Kronos's minions although Percy mistakes Blackjack for a female at the time. Subsequently, he acts as Percy's main method of transport, constantly referring to Percy as "Boss", much to Percy's annoyance. In The Last Olympian, he allows Charles Beckendorf to ride him with Percy's permission and is later hijacked by Rachel Elizabeth Dare to get to Camp Half-Blood quickly, much to Percy's annoyance. In The Blood of Olympus, Blackjack is one of eight Pegasus enlisted by the original Pegasus himself to help carry the Athena Parthenos. Blackjack acts as Nico's steed despite his previous distaste for the son of Hades and comforts Reyna. Blackjack is severely wounded by Orion, but Reyna is able to save his life and he is stated to be recovering nicely after the final battle with Gaea's forces. Guido – A gray and white Pegasus who is friends with Blackjack. In The Last Olympian, Guido and Porkpie aided Percy and Blackjack in the Battle of Manhattan. In The Blood of Olympus, Guido is one of eight Pegasus enlisted by the original Pegasus himself to help transport the Athena Parthenos. After Pegasus' departure and Blackjack being severely wounded, he allows Reyna to ride him the rest of the way to Camp Half-Blood where she rides Guido throughout the battle with Gaea's forces. After the battle, Guido decides to adopt