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I used to do a lot of pheasant hunting with dogs. every year the dogs found several recent kills fully intact and missing the head. The state biologist at the time was a family friend, he claimed it was most likely owls. Its an instincive thing, some of it is to eliminate competition for food, some of it is juveniles practicing skills. (Like a cat learning to hunt). He said most anything else would have at least eaten some choice bit (usually guts, or a hock or breast)