I have 10 ducks and 13 chickens housed in my coop, I lock them up at night and they are out in the morning in a run. I have cattle panel fence with 2 ft of chicken wire and 4 strands of electric fence around the run and coop. My ducks are 7 runner females, 1 Campbell female, and 2 Campbell males. Some are currently laying and one is an excellent mother. Males are currently mating. Yesterday morning I let them out and 2 of my female runners had blood and small cuts on their necks and heads. I cleaned and applied polysporin to them. Last night I put them in their coop and this morning I found one of the injured ones dead with her entire head and neck bloody and down to the bone, also eyes missing (sorry for being graphic). Also we had snow last night and I checked for any tracks near the coop, none. My question is would one of the males killed her and maybe nice ate the head or could one of the females killed her to protect the eggs. Never in 3 yrs had an issues with anything killed in coop. Chickens are all fine. Could use advice.