cuttlefish
Any squid-like cephalopods (marine mollusks) of the order Sepiida that have eight arms, two retractable tentacles, and a calcareous internal shell, and can eject a dark ink when threatened.
Where this comes from
This definition is adapted from “cuttlefish” on Wiktionary, by its contributors, published under CC BY-SA 4.0. This page is published under the same licence.