See some beautiful photography of wild squid. Clues indicate that giant squid grow to 20m long in the pitch-black ocean depths. People are still searching for them. The little ones off the coast of California here are loligo opalescens. They're a decent-sized industry in catching and selling them, and there's an annual Monterey Squid Festival which i got to visit last year.
Squid nerves are unique.
They have the largest axon of any animal, which makes it handy for teaching and research . Squid played a major role in the history of computational neuroscience . The squidpage . They're quiet, largely vegetarian tree-dwellers from Central and South America. I saw some, both captive and wild, in Costa Rica .