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Polar bears swim too!

Coming up for a breather: Killer whales pictured in Arctic ice feature in new amazing Frozen Planet images

Ready for action: A polar bear looks like she has spotted something for lunch for her cubs


Polar Bears by (Mark Philpott)

Have a good sleep. Polar Bear Sleeping in Alaska's Arctic by Patrick J Endres.

Oh I can't even look!

sdzoo: Polar bears have a nictitating membrane, or third eyelid, that allows them to see underwater and protects their eyes in blowing snow. (photo by Clark Oden)