Blanket Octopus - found in the open seas of the Mediterranean and the N and S Atlantic Ocean. The "blanket" is a defense mechanism, as they do not have ink to ward off predators. It will unfurl its blanket, making it look significantly larger and intimidating. It is immune to the poison of the Portuguese man o' war, known for its deadly venom. Taking advantage of their immunity, Blanket Octopuses will rip off the Man o' war's tentacles and use them to defend themselves from attacks.