There’s something pretty great about watching a sea otter do absolutely nothing. Sea otters spend a surprising amount of their day resting. Living in cold water is incredibly demanding, and unlike seals and whales, they don’t have a thick layer of blubber to keep them warm. Instead, they rely on the densest fur of any animal on Earth and a very high metabolism. All that eating, diving, grooming and staying warm takes energy, so when the work is done, it’s time to shut things down for a while. Not a bad place for a nap either.