Polar bears do not live on Antarctica or anywhere near Antarctica. They live at and near the North Pole, mainly on the ice pack. Exclusively a Northern Hemisphere species, polar bears live in a type of habitat that is scarce in the Southern Hemisphere.
Antarctica, like the North Pole, is very icy, but it is less hospitable to life than the Northern Hemisphere. The ice sheets in the northern arctic sit above water teeming with marine life, which supports the ecosystem of polar bears. By contrast, Antarctica largely consists of permanent ice covering dry land. Some animals, such as penguins, live on the edges of the Antarctic ice sheet, but very few animals venture into central Antarctica. Antarctic waters are abundant with life, but the native animals supported by this abundance are mostly birds that can transverse more hospitable islands lying off the coast.