Why can ducks swim and chickens can't?

A duck can swim in the water because its feathers are not afraid of water. Duck's tail has a tail fat gland, which can continuously secrete fat. Ducks often turn their heads around, stick their heads on their tails, and then wipe off their feathers. In other words, they use their heads to smear these fats on their feathers. Fat separates water from feathers, so duck feathers will not be soaked by water. Ducks can swim, but chickens can't. The main difference is their claws. As we can see, ducks have fins on their paws. Every finger on a duck's foot (we might as well call it a foot) is inseparable, and the fingers are connected by fins. Don't underestimate this fin. Ducks can swim beside them. Ducks use their mouths to smear the grease of sebaceous glands on their feathers so that they won't get wet. And the lungs are connected with airbags and webbed fins, so you can swim.