Thanks, Rachael and Tim!
[Chestnut Centre, Derbyshire, U.K.]
Via KQED Science, which writes:
Sea otters aren’t just cute — they’re a vivid example of life on the edge. Unlike whales and other ocean mammals, sea otters have no blubber. Yet they’re still able to keep warm in the frigid Pacific waters. The secret to their survival? A fur coat like no other.