QuickCheck: Do sea otters have pockets for storing rocks?

Sea Otter (Enhydra lutris) preening itself in Morro Bay, California. - Photo courtesy of Mike Baird (bairdphotos.com) - (CC BY 2.0)

IF YOU are a fan of sea otters, you may have observed – either in real life or in a nature documentary – how these adorable, furry critters are masters at using tools.

Otters are known to use rocks to crack open the shells of their favourite prey, usually invertebrates such as crabs, clams and snails.