No. Polar bears are very good swimmers. They use their paws for propulsion in a doggy-paddle style of swimming. They can swim long distances, and have been seen as far as 200 mi or 320 km from land. The issue you are getting at with your question is why are they endangered if they can swim. Their prey, seals, swim much faster than they do. This means that polar bears cannot hunt while they are swimming. They must use a different technique, which is waiting by the seals’ air holes in the ice. If the ice is quickly disappearing and melting, there are fewer opportunities for the bears to catch seals.
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