When you're standing on the outdoor platform of our Polar Rover, the chill Arctic air feels invigorating. But not as much as the sight of the huge polar bear ambling toward us. Sometimes they are silhouetted against the horizon, slowly moving shadows on the vast expanse of tundra. Other times, one may wander up directly below. Out here among the bears, time stands still. It's nearly impossible to describe the feeling, but your photos will capture one of nature's most wondrous wildlife encounters!