How come ducks don’t sink?
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Like all birds, they have hollow bones and very light feathers. Also, most of them have a substance that covers the feathers so they don’t soak up water and get heavy.
Basically, so many parts of their body are lightweight that they float on top of the water with just a part of them being below the surface.
Simple: they are made of fat.
They are less dense than water because they are fairly fatty birds, especially on their breasts. Also all flying birds do have hollow bones to make them lighter and less dense though this is a much smaller factor than the sheer chubbiness that is the water fowl.
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