Throughout 2014, 60 individual bears were tracked with GPS collars. For most of spring time, polar bears stayed on the ice to hunt seals, their favorite meal. Seals are about 50% fat, which is what bears need. To feed themselves and their cubs, polar bears hunt at least one seal a week. Polar bears are powerful predators. In July all the bears were at the coast to hunt. In summer the ice where they hunted started to melt, becoming fragmented. At this point some bears had to decide whether or not to swim out into the open ocean following the retreating ice.
Summer sea ice is becoming increasingly rare. Polar bears catch seals from the sea ice, but if there's no sea ice, polar bears will have to adapt or starve.