National Geographic photos
Common OctopusPhotograph by Luis Miguel Cortes, My ShotThe common octopus is anything but ordinary. This most intelligent of the invertebrates uses an amazing suite of abilities to avoid predators like sharks, eels, and dolphins. A master of camouflage, the octopus can change color and shape to remain unseen, and release a “smoke screen” of black ink when spotted. Even if an octopus has been nabbed, the game isn’t over—it can simply shed an arm to escape trouble and regrow the appendage...