I said good night to my 2 month old Pekin ducks and everything was fine. My husband went out 2 hours later and found one dead with just a little blood on her wing. I'm devastated and can't figure out what happened. They don't have a roof on their house yet so I wonder if she tried to escape and hit her head but they all seem way to heavy to even get off the ground. Could the other 5 girls have hurt her?