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Sea Otters Have the Thickest Fur of Any Animal.

With 600,000 to 1,000,000 hair follicles per square inch, sea otters have the thickest fur of any living animal. Why? Unlike most marine mammals, sea otters do not have a blubber layer, so they rely on their thick, water-resistant fur to keep them warm. In fact, they spend a large portion of each day grooming and conditioning their fur. The process traps air and heat next to their skin, which helps keep them warm.

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