I know plenty of people who do (raise them together) with no problem...I don't know how but they do. Plus there are a number of posts here that say it is o.k. to do so. However, I keep by birds apart. Chickens have their own coop and run, ducks have theirs and geese have theirs. The only time they are remotely together is when I let them out to free range and that is only when I am there with them...mainly to protect from flying predators but also the keep the peace. I am going to have to create a separate free range for the geese though as they are getting more and more aggressive toward both the chickens and the ducks. I admit that I am lucky to have enough space to do all this. If I had less space I would have to focus on only one type of bird..... Guess I just can't raise Ducks and Chickens together!!!!!