I have these two chickens I've had over a year and they are really gentle and shy. Now I have these two ducks that are almost 2 months old and bigger then these chickens, so I had the cage in the coop for almost a month so they could get used to each other. Then on Saturday I let them out of the cage so they could be with the chickens to see how that goes. It was fine until today I went in and the white duck had blood on its back and its wing, but the other black duck was fine. So I watched and when ever the yellow duck got close to the one chicken it pecked at it. I'm not sure if its a dominates thing to get them in order or the chicken just wants to kill the duck. So please let me know what you think!