Among the organisms of the oceans that are armed and dangerous, there is one elite group of jetsetters that grow fast and are blessed with brains, looks, and a talent for disguise. Though most don’t live long, they can react with lightning-quick speed and deploy amazing defensive countermeasures. They are the stars of film and literature, playing oversized and aggressive monsters with a killer appetite. Most of the oceans’ cephalopods, however, are not out for a fight; when trouble calls, the majority of squids, cuttlefishes, and octopuses prefer to hide or run away. They are also much str...