Yep, otters have a favorite rock. Unlike other animals that use tools occasionally, sea otters show remarkable consistency. Once an otter finds a rock that works well, it often keeps the same one ...

In fact, otters will often have a “favorite rock,” they seem to hold especially dear. But one sea otter in California evidently stumbled upon yet another use for hers. Winning over new friends.

The only difference is that an otter might carry its favorite rock forever, according to this post by @humanecanada. Otters do this for several reasons, and you never know when your favorite rock ...