In coop #2 I have 5 1/2 weeks old to 7 week old ducks to 9 month olds plus more. I found 2 of my 5 1/2 week old chicks with broken necks, killed in the run of coop #2. Also, a 5 1/2 week old is missing and a 15 week old has a hurt eye. What predator could have done this?