Sea otters have the densest fur in the animal kingdom—1 million hairs per square inch as opposed to the 150,000 hairs on the entire human head. LEARN MORE:
Sea Otters Are Weird Gross and Beautiful
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Key Facts In This Video
Otter fur has up to 1 million hairs per-square-inch because they have no insulating fat. (0:57)
Otters sleep floating on their backs. (2:16)
Mother seals train baby seals how to swim when they're born, much like humans. (2:55)