High Quality Content by WIKIPEDIA articles! Cuttlefish are marine animals of the order Sepiida. They belong to the class Cephalopoda (which also includes squid, octopuses, and nautiluses). Despite their name, cuttlefish are not fish but molluscs. Recent studies indicate that cuttlefish are among the most intelligent invertebrates. Cuttlefish also have one of the largest brain-to-body size ratios of all invertebrates. The origin of the word cuttlefish can be found in the old English term cudele, which derived in the 15th century from the Norwegian koddi (cushion, testicle) and the Middle German kudel (pouch), a good description of the cephalopod's shape. The Greco-Roman world valued the cephalopod as a source of the unique brown pigment that the creature releases from its siphon when it is alarmed. The word for it in Greek and Latin, sepia (later seppia in Italian), is used to refer to a brown pigment in English.

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