Keep in mind these kind of creatures tend to vary a lot in their representations, so you might have seen them looking a little different or with a little different story before! But if my info is wrong feel free to let me know
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Name: Peryton
Origin: Atlantis
Favorite food: Humans
Habitat: Water
It looks like a combination of a deer and bird, but casts the shadow of a human. They were said very ravenous towards humans and to have been a cause of the downfall of Rome.