Otters

61 2 1
                                    

Otters are thought to have up to one million hairs per square inch. Not only this but they also hold hands while they're sleeping so they don't drift apart. Otters are also adept to using tools. While many scientists believe that tool use among dolphins is a relatively new phenomenon, a study published in Biology Letters suggests that otters may have been using tools for millions of years.

Animal FactsWhere stories live. Discover now