I got 5 WH ducklings 4F, 1M) a month ago from Murray McMurray. They have always had access to shallow water, in a clean paint tray, deeper over time--now 4 inches--by their food. We have had many call ducks, hatched by ducks and broody chickens and they were in water then swimming quite early--LOVED the water. My WH have access to a very shallow "pool" about 6 inches at the deepest. I even put lettuce pieces in to lure them. But they just don't seem interested. Will they swim when they are older? How can I encourage swimming?