Well at least you know what it was and you can make them safe. I thought it was going to be a hawk because when I was chicken sitting for my neighbor I saw a hawk in their run and they have wire zig zagging over top and it still went in. I always assume that wild animals will do everything they can to get their prey because their life depends on it. They will take chances in order to survive and to feed their young. Sometimes things happen and we live and learn. Best to you!