An American black bear climbs quickly up a tree and rests on a branch.

Arctic, Wide shot of a polar bear emerging from icy waters onto sheet ice and yawning tiredly.

Medium shot of an adult polar bear leading two grown cubs across a snow covered tundra in Northern Canada. The furry mother leads the cubs past some rocks which poke from under the snow.

Arctic, Medium shot of a polar bear lying down lethargically on all fours.

Hudson Bay, Canada: Wide view of two polar bears walking along on icy tundra with an orange glowing sky in the background.

Arctic, Wide shot of a polar bear marches slowly towards the camera. Bear's white fur camouflages with a completely snow covered background.

Arctic, Wide shot of a polar bear plodding slowly across deep white snow.

An American black bear climbs quickly up a tree, It pauses for a few seconds, then continues climbing before stopping to rest on a branch.

Medium shot of a polar bear walking and foraging through white arctic snow.

Slow motion footage of two polar bears playfully wresting on frozen plain.

London, England: The Grenadier Guards march through St James' Park in London, wearing large bear fur helmets and playing instruments.

Slow motion footage of two polar bears playing on a frosty plain, they wrestle and bite each other playfully.

An American black bear cub sits on the forest floor, chewing a long branch. It then falls backwards onto its mother. When the mother bear tries to nurture her cub, the cub starts to play fight.

An American black bear rests on some branches high up in a tree.

A restless American black bear cub sits on the forest floor, playing with a long branch.

Knut, the famous Polar bear, drinking from a pond.

Aerial slow motion tracking shot of a polar bear running across snow covered pack ice.

Medium shot of a polar bear emerging from icy waters and shaking wet fur.

Medium shot of a polar bear trudging over white snowfields. Rocks and sea in background.

Medium shot of a male polar bear walking between snow covered boulders.

Panning shot of a furry white polar bear sleeping against another polar bear.

Medium shot of a polar bear sluggishly trudging through white snow.

A bear swimming in water.

Canada: Various long shots of two Polar Bears play fighting in the snow.

A restless American black bear sits on some branches high up in a tree, while another bear tries to climb further up the tree.

Medium shot of a polar bear negotiating deep snow and contoured terrain.

An American black bear explores the forest.

Wide shot of a polar bear crossing ice and diving into the water. Small ice bergs floating in background.

Frankfurt, Germany: Wide shot exterior of Frankfurt Stock Exchange. Close-up shot of Bull statue PAN to Bear statue outside Stock Exchange building.

Knut, the famous Polar bear, looking around his enclosure.

Arctic, Wide shot of a polar bear scratching its back by rolling playfully in snow.

An American black bear cub plays against a tree then wanders off to join another cub and the mother bear.

A restless American black bear cub sits on the forest floor, chewing a long branch, then sticking out its long tongue.

Brown bear mother and its three cubs walk by a pond. One of the cubs runs nearer to the camera, rises on its hind legs and then quickly runs back to its mother and siblings.

Knut, the famous Polar bear, running towards a plate of lettuce and eating from it.

Knut, the famous Polar bear, circling his head and looking around his enclosure.

Knut, the famous Polar bear, sitting on his hind legs and stretching.

Medium shot of a polar bear walking through untracked snow. Lifts head occasionally in a curious manner.

Brown bear mother and its three cubs walk by a pond, all looking very happy.

Medium shot of an adult polar bear slowly leading two cubs through water. Bears occasionally lifting heads towards the camera in a curious manner.

An American black bear rests on some branches high up in a tree and grooms itself.

Close-up shot of the face of an American black bear resting on a branch.

Svalbard, Norway: A polar bear feeds on a seal carcass on an icefloe. The snow and ice is red from the carcass' blood as the polar bear tears the flesh.

Knut, the famous Polar bear cub, licking a man's hand and using its paws to cling to the hand.

An American black bear cub sits calmly on the forest floor. Another bear behind it looks around the forest.

Chukotka, Russia: Shots following a female polar bear with cub, swimming at the surface of the ocean with a mountain range in the background.

Medium shot of a polar bear crossing snow in front of the camera.

Knut, the famous Polar bear, eating from a plate of lettuce.

Shot panning up a statue of a soldier with a bear.

Canada, Hudson Bay. Wide shot of icy bay. Zoom in to polar bear lying on shards of broken ice. Polar bear stumbles walking along on cracked ice