The first genetically-altered squid has scientists thrilled about a potential new way to study the intriguing cephalopods, a group including octopus, cuttlefish, and squid. Creatures that have famously complex brains, the largest of all invertebrates, and behavior including the ability to camouflage themselves (despite being colorblind) count, recognize patterns, problem solve, use tools, mimic other species and communicate using a variety of signals.