All has been well all summer. We have a small flock of 8 chickens (2 roosters 6 Hens) and 2 Rouen ducks one male one female. They are all New 2014 spring hatchlings and have been together since day 2. They all share the same Coup. The 2 roosters used to try to mount the female duck and the Male Duck (his name is Bubbles) would chase them off. The roosters seemed to have lost interest in Susan (female duck) in the past month or so. Today however things have changed. When I went to let the all out(they all free range) I noticed bubbles was injured. looked like he got pecked in his eye and he had blood all over the tip of his bill. Bubbles was slow to get moving but eventually did get out and roam with the others. I did notice that the roosters though were chasing him a good bit today and this is not normal. I was able to catch bubbles and get him isolated in the chicken run. I did also notice that Susan was getting mounted repeatedly by the roosters too. Her neck was mussed up from the roosters grabbing her. I put her also in the Chicken run with bubbles. What I want to know is any ideas why the roosters are doing this? and can I re introduce the ducks back to the Flock?