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The Harpies are three female winged creatures similar to Gargoyles, Ingrid, Hilda and Ulrika, who form an inseparable trio of flying monsters with great intelligence and viciousness.
- The Harpies are based on mythological creatures usually depicted as part bird, part woman.
- In The Book of Monstrox, they are distinguished by their ear color. However, in the show, they have identical appearances, so it is impossible to tell which one is which.
- They are similar to the Three Brothers, as they are three same-gender siblings that work with the Stone Monsters.