Because from the day when there is a species of polar bear on the earth, polar bears have been staying in the North Pole, not the South Pole. I think God must have given polar bears such a birthplace for its own reasons. I can only guess from my perspective. First of all, because polar bears were born in the Arctic, they are used to life in the Arctic. In order to resist the cold, their corresponding organs have changed to some extent.

For example, the fat layer on polar bears is developed through constant adaptation and evolution. In fact, I think most animals are very similar to polar bears. In order to knock them down in their own habitat, they will gradually change slightly with the change of environment. For example, the butterfly in the jungle, in order not to be discovered by natural enemies, turned its body into a leaf with the same color as the leaf.

There are stars in nature, our chameleon friend. They are all over the continents. Each chameleon in different geographical locations has its own unique shape and color. The most wonderful thing is that its color will change with the color of the surrounding environment. In fact, the purpose of doing this is to protect themselves from the pursuit of natural enemies. This long-term integration with the environment is actually not easy to change, so this is also the reason why polar bears can't stay in the Antarctic.

Moreover, the temperature in the South Pole is lower than that in the North Pole, so the polar bear may not be able to stay in the North Pole at present. However, the environmental situation in Antarctica is not optimistic now. Because of global warming, the habitat of polar bears has also been destroyed, and many glaciers have begun to melt, which further reduces the land area of polar bears. However, polar bears cannot swim like penguins. Now that there are fewer glaciers, life must be harder than before.