Why Does Water Roll Off a Duck’s Back?

This happens because oil and water don’t mix.

water off a duck's back

When a duck is swimming or out in the rain, the bird secretes an oil from glands near its tail. With its bill, the duck rubs the oil over its body.

why does water roll off a ducks back

The oil keeps the water from soaking through the duck’s feathers, making the bird “waterproof.”

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Karen Hill is a freelance writer, editor, and columnist for zippyfacts.com. Born in New York, she loves interesting random facts from all over the world.