* Geography: Polar bears are native to the Arctic, which is the region surrounding the North Pole. The Antarctic is at the South Pole, separated by vast oceans.
* Diet: Polar bears primarily feed on seals, which they hunt on sea ice. The Antarctic has very little sea ice, as the surrounding ocean is much colder and deeper.
* Climate: While both regions are cold, the Antarctic is significantly colder and windier than the Arctic. The harsh climate would make it difficult for polar bears to survive.
* Competition: The Antarctic is home to a variety of predators, including leopard seals, orcas, and penguins. Polar bears would face intense competition for food and resources.
In essence, the Antarctic environment is simply not suitable for polar bears.