Here's why:
* Adaptations for ice and snow: Polar bears have evolved for a life on the Arctic ice and snow. Their large paws with rough pads provide excellent traction on slippery surfaces.
* Body structure: They have a stocky, heavy build, which makes them less agile and less suited for climbing.
* No need to climb: Polar bears primarily hunt seals on the ice and don't need to climb trees for food or shelter.