* Sea Otters: These adorable creatures are the smallest marine mammals and are known for their dense, thick fur that keeps them warm in cold waters.
* Polar Bears: While they spend much of their time on land, polar bears are excellent swimmers and rely on the water to hunt seals. Their fur is a thick layer of guard hairs with a dense undercoat for insulation.
* Seals: This group includes harbor seals, grey seals, and harp seals, all of which have fur and spend a significant amount of time in the water.
* Walruses: These large, tusked marine mammals are well-adapted for swimming with their streamlined bodies and thick blubber layer beneath their fur.
* River Otters: These playful creatures are found in rivers and lakes and are skilled swimmers. They have a thick, water-repellent coat that keeps them warm in the water.
These are just a few examples, and there are many other animals that exhibit both swimming and fur.