I tried doing this in the spring...I have 2 mallard ducks. I put a fairly large turkey poult, a baby goose, and several chicken pullets in with the ducks. Everybody got along...but the next few days, I found the turkey and a chicken had drowned in the small tub that the ducks swim in. (Even though it has a cement block in the middle to climb on, and a step to get in/out. ) Now I have the now-grown goose, and chickens free-ranging, and have another turkey poult in a different pen. Is is just too dangerous to put fowl in with the ducks? it seems they do not know how to get out of the water if they get in it, even if it is shallow, with steps. Any info would help..I do not want another drowning.