Well, today I am going to tell you about real polar bears, by which I mean the ones who live in the Wild Arctic and not in the zoo. Polar bears are designed to stay warm even when the temperature is very cold, so that way they can live in the frozen north and hunt for seals, which they find to be especially yummy. The seals are also designed to stay warm in the cold weather, so it works out nicely for the polar bears.
The adult bears mostly eat the skin and blubber of a seal, which has lots of calories, and the younger bears eat the meat, which is full of protein. If Polar bears can't find seals to eat, they might eat some other kind of meat. They have been known to climb cliffs to get birds and eggs. Usually, Polar bears don't eat people, but if they are hungry enough, they may start eating more of them. And also they will start raiding garbage cans and stuff, which will make the bears more dangerous to people because they will be coming more often to the places where people live.
So it's a bad situation for the Polar bears, and maybe the ones like Nikita who live in zoos have a pretty good life, after all. But it would be very sad if it turned out someday that the only place where there were any Polar bears was in zoos.