Sea Otters have a pouch to store their favorite rocks!

The sea otter is the smallest marine mammal. It's a member of the weasel family and is the only marine mammal that doesn't have blubber to keep itself warm.

These remarkable creatures have very agile forepaws. They can rub, twist and pull with great strength and the paws even have retractable claws.

Under each forearm sea otters have a baggy pocket of lose skin. What do they use it for? Storing food and also their favorite rocks that they use to crack open mollusks and clams.

Of course, our favorite thing about the sea otter is that they hold hands when they're asleep so they don't float away.

(Source)