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Octopus or sprutovye the most famous representatives of cephalopod mollusks. Typical octopus which are described in this article the representatives of the suborder Incirrina bottom-dwelling animals. But some members of this suborder and all kinds of second suborder cirrina pelagic animals living in the water column with many of them are found only at great depths. Science that studies the octopus and other cephalopods called teuthology.

At the octopus body is short soft oval back. The mouth opening is located in a place where its tentacles converge, and the anus is opened under the cloak. Mantle resembles wrinkled leather bag. Mouth equipped with two powerful jaws similar to the beak of a parrot. The pharynx has a grater which frays food.

The head carries eight long tentacles hands. Hand are connected by a thin membrane and have from one to three rows of suction cups. On all eight tentacles of an adult about 2000 each of which has a holding force of about 100 g and in contrast to the man-made the suckers require effort on hold not with suction they are held only muscular effort.

Octopuses three hearts one drives a blue blood throughout the body while the other two gill pushing blood through the gills.

Some species are poisonous octopus. Blue-ringed inhabit the western shores of the Pacific Ocean are among the most poisonous animal in the world.

Octopuses have the unusual ability thanks to the absence of bones they can change shape. For example, some during hunting flattening at the bottom by masquerading as a flounder. Also, they can pass freely through the holes of diameter 6 cm and remain in a confined space is 1/4 of the volume of the body.

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