Quick Take The blue-ringed octopus has extremely potent venom, capable of killing a human victim. These octopuses contain a ...

An Australian teenager had a lucky escape after being bitten by one of the world's most toxic animals, a blue-ringed octopus, after accidentally picking up the deadly cephalopod hiding in a shell. But ...

Octopuses already exist in a strange corner of the animal world, with soft bodies, problem-solving brains, and the ability to change color in a blink. Even within that group, a handful of species push ...

With a split-second muscle contraction, the greater blue-ringed octopus can change the size and color of the namesake patterns on its skin for purposes of deception, camouflage and signaling.