I had my Cayuga and 4 mystery ducklings (TSC said they were pekins but we don't think so) playing in the bathtub. I had just enough water in the tub that they could swim. They are about a month old now. They are just barely showing signs of feather growth. I stayed with them since they're not feathered and made sure they could actually stand up if they really had to. The mystery ducks actually dove under the water and swam around. It was quite funny to watch. Anyhow, one of the mystery ducks got carried away in his excitement. Next thing I knew, he was coughing water up out of his mouth and nostrils. He recovered his breathing but it was obvious he still had a lot of water in him. I turned him upside down and squeezed the "water balloon" looking area and more water came out. I let him catch his breath again and tried one more time but no more water came out. He still had the squishy area so I know there was more water but he seemed ok so I let him go play. So to avoid boring you further, is it possible for young ducks to drown themselves by playing in water? He didn't go down due to still being covered in down instead of feathers, he ingested the water while vigorously playing.