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Why ducks can swim

Ducks can swim but chickens can't. The main difference is in their claws. There are fins on the feet of ducks. As we can see, every finger on a duck's foot (let's call it a foot) is not separated. The fingers are connected together by the web. Don't underestimate this web. Ducks can swim by it. Ducks use their beaks to smear the fat of sebaceous glands on their feathers so that their hair will not get wet The air stays in the feathers and floats. And there's an air bag connected to the lung, and with webbing, you can swim