Below is a still from a new BBC series, Planet Earth. I watched the first episode last weekend and was humbled by the grandeur of nature. There really is no need to watch the fantastic fiction of Hollywood; tales of the struggles of the varieties of life on Earth far surpass any story a human mind can concoct.
The series is a classic BBC quality production. Davis Attenborough narrates and, get this for novelty, he is not seen in camera shot once - No, the stars of the show are the animals, no need for the wonderful Mr Attenborough to sully his himself with self-promotion.
Here's a link where you can watch clips.
BBC - Science & Nature - Planet Earth for non-UK users
Check out the "polar bear swim" clip in the Living Organisms section.