MNN Galleries

15 remarkable animals that use tools

By: Bryan Nelson on Oct. 28, 2009, 10:09 a.m.
A sea otter holds a rock in its paws.

Photo: Neil Aronson/Shutterstock

12 of 17

Sea otter

Even the strong jaws of the sea otter aren't always enough to pry open a tasty clam or oyster. That's when the charismatic marine mammal gets wise. An otter regularly carries a stone around on its belly and uses it to pound open its mollusk meal.