You would be surprised at the size of animal a hawk can pick up. I'll have to do some searching in native animals to know for sure, but I still think that is a likely option. Especially if you don't find any tracks leading away from the attack sites. If it is during the day then you can mostly rule out owls.
If you keep the cams up I think you will eventually catch sight of whatever it is. I also agree it might be a good idea to get a guard dog only my suggestion would be a shepard or rottie. In my experience, pits tend to chase animals too much. But that's just my opinion.
ETA: I just found this link from the University of Oklahoma that may be useful. It gives a few ways of determining the type of culprit. Just thought you would be interested. Predators
edit on
5/19/2011 by glitch88 because: (no reason given)

