The sea otter in this amazing video clip is making the cutest trade! In the video, the sea otter offers a fisherman a pebble in exchange for a fish, securing a fantastic deal. This behavior requires ...

(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 ...