What is the function of a muscle hump of a polar bear?

The muscle hump of a polar bear, located on its back, serves several important functions. Primarily, it provides strength and support for the bear's powerful front limbs, which are essential for swimming and hunting in icy waters. Additionally, the muscle hump helps store energy reserves, aiding the bear in maintaining stamina during long periods without food. This adaptation is crucial for survival in the harsh Arctic environment where food can be scarce.