Coconut octopuses are among the most intelligent invertebrates around: They use tools, carry their shelters around for when they need them, and, fittingly, adopt an underwater walking motion that's ...

When hunting for tasty morsels like crabs and scallops, octopuses must watch out for predators at all times. That's why some of these brainy, eight-legged creatures bring along ready-made body ...

Octopuses have a way of making familiar rules feel optional. They live on Earth but behave like visitors with a different instruction manual. Scientists study them for answers about intelligence and ...