A video was released by the US Geological Survey (USGS) on Friday, showing a bear walking on sea ice, swimming, trying to eat a frozen seal and playing with a potential mate. It is the first-ever video shot from the perspective of a polar bear on Arctic sea. Actually, video-collar devices were fitted on four polar bears on the sea ice north of Prudhoe Bay, Alaska, in April, by Todd Atwood, who works at USGS' polar bear research program, and colleagues.