Add Yahoo as a preferred source to see more of our stories on Google. Image via Shutterstock/Neil Aronson (Image via Shutterstock/Neil Aronson) Did you know that sea otters have favorite rocks ...

Add Yahoo as a preferred source to see more of our stories on Google. A wild sea otter in the waters of Seward, Alaska near Kenai Fjords National Park in the Kenai ...

If you’ve ever walked the beach and pocketed a neat-looking rock, know that you share something in common with otters. The only difference is that an otter might carry its favorite rock forever, ...

(Reuters) - Humans are not alone in the use of tools. Chimpanzees, for instance, crack nuts with stones and use sticks to get at tasty termites. Dolphins are known to employ sponges to protect their ...