A Group Of Animals Living And Moving Together Means Octopus and Squid

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Octopus and Squid

Squid and octopus are members of the class Cephalopoda, which together with sea slugs, bivalves, univalves, chitons, and other shells form a large phylum of animals known as mollusca, often called shellfish.

Molluscs form a large group that includes 100,000 different species. Marine molluscs have many habitats, from above the high tide mark to the bottom of the deep sea and even drifting in plankton and floating on the ocean surface. The cephalopods, of which there are several hundred species, are completely aquatic, and can be grouped into three main groups: squid, octopus, and primitive nautiloids.

The squid has 10 tentacles around the mouth and head, two of which are very elongated. Transport is by water jet, a method also used by the octopus and the nautilus. Water is drawn into a small orifice, and driven under great pressure from a mobile siphon so that the animal can move in any direction it chooses. In addition the squid coat is sometimes used as an aid in positioning by means of ripping along the sides.

Octopuses have two arms, and a hard beak with its mouth in the middle of the arms. Like squid, octopuses do not have internal or external bones, which allows them to squeeze into very hard places. Scientific tests have shown that octopuses are very intelligent and may be the smartest of all invertebrates. Many octopuses have an ink chamber which allows them to expel a dark colored liquid which gives them cover to escape from predators.

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