Well, I have to disagree that no chicken can swim at all. Today, one of my older hens walked right into the pool for the first time. She flapped her wings and kept "paddling" until she reached the side and pulled herself out. I was about to scoop her out with the leaf net but she made it out by herself. She's pretty fat, so she might even float. So it is possible for a chicken to "swim" a short distance, as mine did. I doubt she would have done well with an extended dip. Other chickens might not be as skilled (or lucky). I have seen chickens drown in the waterer, but usually only if they get their head caught. My cat can also swim, but one of the dogs panics and sinks. So it probably depends on the individual animal.