Blue-ringed octopuses carry a killer concoction called tetrodotoxin (TTX), a potent neurotoxin that can paralyze living ...

Kat Zhou has won the Aquatic Life category in the 2025 BigPicture Natural World Photography Competition, while a shot of a ...

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 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.

Discover eleven octopus species that highlight the beauty and diversity of the Octopoda order, from the giant Pacific octopus to the mimic octopus.

Scientists have discovered at least four new species of octopus in the deep waters of a 100-square-mile area near Costa Rica, officials from the Schmidt Ocean Institute said on Tuesday.

The new octopus species may have been found in a rare brooding site that marks only the third octopus nursery known to exist in the world.

The venomous blue-lined octopus is one of many species that engages in sexual cannibalism.

One way to tell the difference between a squid and an octopus: Count the arms. Find out which has more appendages, plus other distinctive characteristics.

A study finds that the gloomy octopus — its real name — is in the small club of animals that toss things at other members of their own species.