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The original was posted on /r/todayilearned by /u/wilsonofoz on 2025-01-28 13:49:41+00:00.

Original Title: TIL a polar bear swam continuously for 687 kilometres (426 miles) in the Beaufort Sea. She swam for 232 hours or 9 days straight, in waters that were 2-6 degrees celsius, resulting in her cub dying and a drop in her body fat