Squid Communicate With a Secret, Skin-Powered Alphabet
Squid and their cephalopod brethren have been the inspiration for many a science fiction creature. Their slippery appendages, huge proportions, and inking abilities can be downright shudder-inducing. (See: Arrival.) But you should probably be more concerned by the cephalopod\u2019s huge brain\u2014which not only helps it solve tricky puzzles, but also lets it converse in its own sign language.