Eddie the sea otter, a creature that found viral fame in 2013, has passed away shortly before his 21st birthday. Oregon Zoo, where Eddie lived, confirmed he had been euthanised on Thursday morning ...

By comparison, a dog has about 60,000 hairs per square inch. Otters don't have a blubber layer like most marine mammals, it's the fur that keeps them warm and allows them to live in Alaskan waters." ...

They have the densest fur in the animal kingdom – a million hairs per square inch. Sea otters are the smallest marine mammals on earth. They have well rounded teeth adapted for crushing shells ...