CNN — When sea otters hammer mussel shells against rocks to help open them, they're leaving behind their own archaeological record that can't be compared to any other creature, according to a new ...

Did you know that sea otters have favorite rocks they keep around to help them open up clam shells and other shelled mollusks? They have loose pockets of fur under each of their arms where they store ...

A southern sea otter with a purple sea urchin in Monterey Bay, California. (Credit: Morgan Rector) (CN) — Sea otters are voracious eaters, munching away on shellfish, urchins and other invertebrates ...