Polar Bears are mammals; therefore they use the same systems as humans to move. These systems are the muscle, skeletal and nervous systems. However, these systems have adapted for life in the harsh Arctic environment. The skeletal system of a polar bear is specially adapted for swimming and diving for food, because the skull is narrower and more streamlined and the neck is longer, which makes diving for food easier. The muscles of a polar bear are stronger than most other mammals so that they can swim for food, with the front legs being more muscular than the hind legs because the front legs are used to doggy paddle and the rear legs are used as rudders (Rushman, 2003).