Watch a stunning octopus squeeze itself into a tiny hole in the sand and disappear. I'd never guess that a creature as large as this Octopus could fit through such a narrow opening.

Discover how researchers identified an octopus' ancient sex chromosomes and why their genetic history is such a mystery.

"I was actively looking for them... now I see multiple octopus," he said. "We are seeing them out in the sand burrowing down, on reefs and in areas you would not expect out in the open.

After a moment, the octopus climbs out of the shell. Its body is the size of your thumb, its arms perhaps three times that. As it moves onto the sand, it turns a matching shade of dark gray.

The octopus is then seen clinging to his leg ... The muscular model is then sseen pouring seawater over the mollusc on the sand and allowing it to slither across his back in what appeared to ...