A Group Of Animals Living And Moving Together Is Called Octopus and Squid

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Octopus and Squid

Squids and octopuses are members of the class Cephalopoda, which together with sea slugs, bivalves, univalves, chitons and other shells make up the large group of animals known as molluscs, commonly called shellfish.

Molluscs form a large group that includes over 100,000 different species. Marine molluscs have a wide range of habitats, from above the high tide mark to the bottom of the deep sea and even move on plankton and swim on the surface of the ocean. Cephalopods, of which there are several hundred species, are entirely marine and can be grouped into three main divisions: squids, octopuses and primitive nautiloids.

Squids have 10 tentacles surrounding the mouth and head, two of which are very elongated. Locomotion is by means of a current of water, a method also used by the octopus and the nautilus. Water is drawn into a small hole and forced out under great pressure by a movable siphon so that the animal can move in any direction it chooses. In addition, the squid mantle is sometimes used as an aid in locomotion by means of an undulating motion along the sides.

Octopuses have four pairs of arms, and a strong beak with its mouth in the center of the arms. Like the squid, the octopus has no internal or external skeleton, which allows them to squeeze into very tight spaces. Scientific tests have shown that octopuses are highly intelligent and may be the most intelligent of all invertebrates. Many species of octopus have an ink chamber that allows them to secrete a dark colored liquid that gives them cover to escape predators.

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