Grooming, Playing = 5 hours
Wet fur’s okay. Wet skin? Forget it.
Unlike seals, sea otters don't have blubber to keep them warm in frigid 35- to 60-degree (F) ocean waters. They have air-bubble-trapping fur -- the densest fur on Earth. Each square inch of their bodies is covered with 600,000 to one million hairs. An entire human head has only about 100,000 hairs.
Sea otters spend more than a quarter of their day cleaning and rubbing air bubbles and their own body oils into the long, coarse guard hairs and short, fine under-fur that trap the bubbles. Unless their fur becomes matted, from an oil spill, for example, sea otters’ skin never gets wet.