On a rocky outcrop almost 2 miles beneath the surface of the Pacific Ocean off Costa Rica, researchers have documented an active octopus nursery. It may be the third known example of a brooding site ...

Off the south-west coast of the UK, a creature usually glimpsed only by divers and night-fishing crews suddenly became impossible to ignore. Through 2025, common octopus numbers surged so dramatically ...

Editor’s Note: Sign up for CNN’s Wonder Theory science newsletter. Explore the universe with news on fascinating discoveries, scientific advancements and more. During a three-week expedition this ...