I suspect it was a cat. If it had been something that didn't belong on our property, Sparkie would have gone nuts, but he didn't bark at all last night. Sparkie found the head this morning, but we didn't find a body. They were all there last night, as was the cat in question. This morning both cat and turkey body are missing. This particular cat is the only one that we would suspect of killing. We've caught him "stalking" the chickens, but they let him have what for if he gets too close. The turkeys are so sweet and docile though.