2.4M views · 6.4K shares | See how these clever octopuses use shells for shelter and protection. | National Geographic | Facebook

With the ability to grow up to 30 feet (9 meters) long, the giant Pacific octopus has been known to eat sharks. | National Geographic

18M views · 16K reactions | Just a month after mating, a female octopus can lay as many as 100,000 eggs. | National Geographic | Facebook

WATCH: This octopus was seen more than 5200 feet below the surface in the Pacific Ocean. In the video researchers on Exploration Vessel Nautilus described the octopus they spotted as "huge" and that it was "billowing its arms like a circus tent." | CBS Newspath

See footage of a rare, swift octopus attack on an unsuspecting crab—one so aggressive it surprised even marine biologists. | National Geographic