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Polar bears are large animals that live in the Arctic. Adult males usually weigh between 300 and 800 kilograms. Polar bears have thick fur and a layer of fat which protect them from the cold. They are also excellent swimmers and can travel long distances through icy water. Their main food is seals. Polar bears usually hunt them from sea ice. This is why changes in Arctic ice are a serious problem for these animals. The Arctic is warming, and the amount of summer sea ice has decreased over the last few decades. As a result, polar bears may have less time and space for hunting. Today, scientists carefully study their populations and the changes in their natural environment.