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Record snowfall gives deep cover for rodents like the vole.
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Hidden beneath, they're protected from the cold and hunters above.
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The vole's ears are big and can listen out for danger.
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But what good is that if danger makes no sound?
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Silence is the Snowy Owl's secret weapon.
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Fringed edges of her flight feathers break up the flapping noise that a normal bird makes.
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And her attack is as silent as death.
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The vole never knew what hit him.