You just *otter* learn about sea otters. 🦦 When they're born, sea otters have buoyant fur that makes them float like corks, unable to dive. So pups are completely dependent on their mothers for weeks. As adults, they have water-resistant fur with up to a million hair follicles per square inch: the densest fur in the animal kingdom. Cozy! That fur creates a wetsuit-like layer that helps keep them warm, unlike the blubber that insulates most marine mammals. Sadly that thick, resplendent coat has