The last sighting of the glass octopus was in 2021, and scientists still don't know much about this highly elusive species.

Octopus fossils are rare ... The word is Greek for “head-foot” and refers to their weird anatomy, by which their arms are attached directly to one side of their head while their “torso ...

Imagine a creature so bizarre that it feels straight out of a science fiction novel—a being with not just one, but three hearts, and an astonishing nine brains. This is not a mythical sea monster but ...

Unlike the octopus's arms, which that animal often uses to move and carry objects, the cuttlefish's eight arms are specialized for grasping prey after the cuttlefish captures it with its two ...

In this interactive feature, take a look at select parts of this octopus relative and learn more about how this master of deception and disguise functions.—Rima Chaddha ...