I am thinking of getting a couple of ducks. Currently I have 12 hens of various breeds which would range together with the ducks in my yard. My plan was to set up a raised pond area. My question.....is it too risky with chickens to have a pond (it would be the size of a garden tub...a little deeper than a kiddie pool)? I'm worried about the chickens falling in and drowning. Is that common?