Why are they called ferals?

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I know its a long shot, but does anyone know of any good research papers or books on zoophilia / bestiality? I've been wanting to do some research on it for a while now, but I never know where to look. And it isn't like I can ask my local librarian, "Hey, I like the idea of fucking animals, you know any good papers on that?"

Literally any leads would be a god-send.

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