A Giant Squid Was First Filmed Alive in Its Habitat in 2012

With no bones, the only hard part of an octopus is its beak, so it can slip through tiny openings.

The dark cloud confuses the predator's vision and, in some species, dulls its sense of smell.

Its relatives date back roughly 500 million years, and it is the only cephalopod with a chambered outer shell.

Their pupils are shaped like the letter W, and they use them to see very well in varied light.