Hi. This hopefully won't get too lengthy but here goes....I have the following set up: 17 chickens, 4 rouens, 5 muscovys. The muscovys are new having brought them into the fold about a month ago. The pen they all share is very big along with a large outside area. When I brought the Muscovys home I put them in with the other birds and all was well for about three days. On day four the muscovys flew out of the pen and wouldn't be coaxed back in. The rouens were giving them a hard time. I put them back into the shed but fenced off from the rouen/chicken population. Two days ago, the rouens got out and in with the muscovys while I was feeding them. They immediately got on a male and where picking and beating him up. I stopped them. The female muscovys they tried to court nd basically left them alone. Yesterday, a female muscovy decided to go in with the rouens. I figured that being a female she would be ok....NOPE!!! I went in this morning to feed and water and the poor little dear was dead. Her head was a mangled mess and the ducks were still at her frozen corpse (Gross). I feel TERRIBLE and GUILTY. Is this behavior normal? I have had ducks a long time and have never encountered this. Obviously, I won't allow them together but what about in Spring when the weather warms...can they free range together? Will the rouens attack their ducklings? Do I have a ravaging flock of cannibalistic rouens or has this come about due to my inexperience with Muscovys? Any advice will be much appreciated. Thank you in advance.