Scientists say a deep-sea octopus squid leaves the tip of its arms behind to escape predators. The unusual defensive strategy is used by the foot-long Octopoteuthis deletron found deep in the Pacific Ocean. The animals grabs onto a predator and then leaves the tips of its arms attached as a distraction. The arms, which have bioluminescent tips, twitch and glow creating a diversion. The squid are able to re-grow their missing arms.