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