Ducks need to be able to dunk their heads. Mostly their nostrils to clear them. With the three Pekins ducklings, we are using a dog bowl. deep enough for them to get their beaks in good and clean thins out. They tend to climb in for swims. We do give them a twice daily swim in the tub. One if during cleaning time, when we clean out their bin. DH or I cleans the bins while the other watches the ducklings in the tub. The other is right before bed. The ducklings go to sleep and we get to sleep, too.