We have some ducks in a chain link fence enclosure (dog kennel) with no roof. Yesterday when we were going to feed the ducks we found one dead in the shelter with its neck striped. We found on the outside of the enclosure there were bird tracks, but that could just be magpies (a bird that feeds on carrion). Now today we found a duck with the neck and head off and a neck bone lying somewhere. What could this be? Please keep in mind that as we are in Canada we do not have raccoons or anything. We have had foxes, but would they climb chainlink? We also have skunks, could it be that?