Octopuses have a central brain and a complex nervous system. These enable each of their eight arms to move independently.
The veined octopus was the first invertebrate to be seen using tools. It carries seashells or broken coconut shells. The animal hides inside—either for protection or to sneak up on its prey.
Speaking of being sneaky, in 2016, an octopus in an aquarium in New Zealand made a daring escape. It squirmed through a tiny opening in its tank, scooted across the floor, and wiggled down a narrow pipe that led to the ocean.