This reminds me of a few years ago when I was ferreting rabbits, we had a line of dead rabbits totalling about 30, when I went to add another to the line about 10 had disappeared! on searching around the area I saw a rabbits foot sticking out of the grass a few meters away, on further investigation we found a hole in the grass with a dead rabbit lying inside the entrance, we took a spade and dug down a little and retrieved our rabbits, I think a stoat was the culprit, we put a rabbit back down the hole on leaving, he must have worked hard to drag those rabbits away.