Reindeer hooves change with the seasons to help them walk on snow.
In winter the hoof edges get sharp to grip ice. Reindeer can also dig for food under the snow.
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The arctic fox turns brown in summer and white in winter.
A narwhal has a long spiral tusk, like a unicorn of the sea.
A walrus uses its long tusks to help pull itself out of the water.
The snowy owl has feathers on its feet, like warm little boots.
The polar bear is the biggest bear that walks the earth today.