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 ...

Sea otters are the smallest marine mammals, but they have some incredible adaptations to thrive in the ocean. Unlike seals and whales, they don’t have a thick layer of blubber to keep them warm.

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, ...

Otters are well known for their playful, energetic, and inquisitive behavior. However, did you know that otter play has a purpose other than just having fun? Or that otters are some of the most ...

NPR's Juana Summers speaks to researcher Rikke Jeppesen about her work on how sea otters, which were hunted to almost near extinction, have been able to thrive by eating up to 120,000 crabs a year.