The octopus is one of the world’s most alien creatures, but nothing puts that into perspective more than the physiological ...

Unlike other octopus species, dumbo octopuses don't have ink sacks, presumably because they don't encounter as many predators at such great depths. 5. of 11. Blue-Ringed Octopus .

A Casper octopus photographed deep underwater. Discovered in 2016, this is the first time this rare octopus species—yet to receive its scientific name—has been seen in the Southern Pacific.

A new species of octopus may have just been discovered off the coast of Costa Rica. It was found in a rare brooding site that marks only the third octopus nursery known to exist in the world.

W hat goes on beneath the waves is a mystery to many people. While scientists can work out whale behavior, discover new ...

A new study found that some members of an octopus species hunt cooperatively in groups with fish. Video shows octopuses punching their companion fish to keep them on task and contributing to the hunt.

A new species of flapjack octopus, with massive eyes and blood-red tentacles, has been discovered from a deep-sea canyon off the coast of Australia.

A new study found that some members of an octopus species hunt cooperatively in groups with fish. Video shows octopuses punching their companion fish to keep them on task and contributing to the hunt.

Earth is no stranger to extinctions. As scientists have discerned from fossil records, species on Earth have already passed through five mass extinction events in the planet’s lifetime ...

But while other octopus species have evolved longer mating arms that allow them to maintain a safe distance during copulation and avoid this fate, blue-lined octopuses have a comparatively short ...