Scientists believe they may grow as long as 75 feet. Giant squid attacking a mosasaur. No living giant squid has ever been maintained in an aquarium or marine institution. This adds to the intrigue of these creatures of the deep sea. What is known is fascinating.
Giant squid have the most highly developed brain of any invertebrate.
They have the largest eye in the animal kingdom, as large as a hubcap. Unlike the octopus, giant squids have 10 tentacles. The eight shorter arms are as thick as a man's thigh and have rows of circular toothed suckers. Two longer, thinner tentacles end in club-like extensions used for acquiring prey. At the center of this teeming mass is a strong parrot-like beak coupled with a toothed tongue.