I went out at 10:30pm to find one of our Cayuga Duck with its head laying 3 inches from its body. Only a few feather around it, did not look like there was a struggle. The duck looks unharmed except for the head is off, no bite marks, wounds or missing feathers. There was only a small spot of blood. They are in a pen with 2x4 metal fencing that is 52 tall. No holes where dug into pen. It is like someone walked in, grabbed the duck and pulled its head off and set it down, except no blood. There is 2 other ducks in the pen and they fine (although they did not come out of their house all day). It is attached to our chicken coop that has 14 chickens and 2 baby peacocks. We are very worried about the rest of our animals! We have no idea what would have done this and would appreciate any help! Thanks!