They do tend to be a bit more skittish. And they are messier. We originally had them in with our chickens, but I ended up separating them. The ducks would jump into the waterer and splash around, making a mess. Not good for the chickens. We tried letting the ducks run free range for a while, but lost several. Whether they ran away or critters got them, or something else, don't know. But they are now penned up again, separated from the chickens. The runners are good layers, but tend not to lay in nesting boxes. They just drop the egg wherever they are at at the time.