Blue-ringed octopuses carry a killer concoction called tetrodotoxin (TTX), a potent neurotoxin that can paralyze living things, including humans. Tetrodotoxin is most famously known from pufferfish — ...

But for Octopus briareus and many other octopus species, the story has a nasty ending. After a mother octopus lays a clutch ...

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 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.

Deep-sea creatures often look more like science fiction monsters than marine animals. The glass octopus is one such animal. The Schmidt Ocean Institute captured this footage of the incredibly rare ...

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.

Scientists using ROV found octopus with long arms, large eyes on ocean floor and discovered new species: Feitian’s Dumbo octopus, study said & photos show.

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 ...

Scientists using ROV found octopus with long arms, large eyes on ocean floor and discovered new species: Feitian’s Dumbo octopus, study said & photos show.

Scientists using ROV found octopus with long arms, large eyes on ocean floor and discovered new species: Feitian’s Dumbo octopus, study said & photos show.