Lurking in the ocean's twilight zone - an area between 650 and 3,000 feet below the surface where light rarely reaches - is the seven-arm octopus (Haliphron atlanticus). Also known as the septopus, ...

The octopus is a striking creature. Their most defining feature, of course, is their eight arms. A new study of octopuses has now documented exactly how those eight arms are used in the wild.