The waters won’t be frozen for several month which is the season for seal hunting for the polar bears. While this moment arrives the polar bears divide their time between sleeping, eating any kind of carcasses (they are opportunistic animals) and going back to sleep. As food is scarce they have to preserve their energy and the best way to do this is to get comfortable anywhere and sleep as long as possible. It is vital for the polar bears to hunt seals, their principal source of nourishment, and this can only occur when the sea water is converted into a sea of ice. Here the bears can ambush the seals that are resting, both on the ice as well as the sea. The bears stalk the seals, by hiding in amongst the ice so as to get as close as possible without being seen and then pouncing onto the surprised seals.