Octopus - a representative of the detachment of marine mollusks belonging to the class of cephalopods.For all species characteristic sacciform torso.Later in the article we find out the characteristics of these animals, as the octopus legs.Photography shellfish will be given below.
Short description
octopus have three hearts.Main surpasses the blood through the body.The rest of it is pushed through the gills.Due to the fact that plasma and erythrocytes present hemocyanin (it replaces iron, copper) in place of the hemoglobin in the blood of animals blue.At Octopus big eyes with a rectangular pupil.The head of the animal is well developed, it has a cartilaginous skull.It protects the brain from embryonic cortex.The size of the animal - from 50 mm to 9.8 m (between the ends of the tentacles, situated opposite).
Power
All octopuses - predators.Their main food is shellfish, fish, shellfish.Common octopus captures prey with all its tentacles.Hold suckers sacrifice, he bites her with his beak.The production gets wound poison from the salivary glands.For octopus characteristic expression of individual preferences in food and ways of its obtaining.The mollusk has four pairs of tentacles.How many legs an octopus, and whether he has hands, it turned on.
Shellfish in motion
Most species live among the rocks, seaweed and rocks.A favorite refuge of young animals in the Far East, for example, are the empty shells of the scallop.Due to the fact that octopi are very active at night, they are considered nocturnal animals.So, how many legs an octopus?How did he use his limbs?By solid, including steep surfaces mollusks move on all fours.This involves all the tentacles.Many believe that the octopus eight legs.However, this is not true.During investigations it was found that the clam pushes two tentacles.To move forward, he uses the rest of the limb.Movement "hands" are similar to those that make swimmers.A pair of hind limb is used to move along the seabed.With their help, shellfish and climbs the underwater rocks.Thus, the number of legs of an octopus - 2, all the other tentacles perform the function of the hands.Due to the fact that the body of mollusks flexible, they can penetrate the slots or openings whose dimensions are much smaller than their own.This allows them to hide in various shelters.
Behavior
Many species have special glands that produce a dark liquid - "ink".In the form of semi-transparent stain shapeless liquid hangs in the water and held for a while compact before it does not dilute the water.Fleeing from someone fleeing octopus produces streams of ink.Zoologists have to date there is no consensus about the goals of this behavior.Cousteau researcher hypothesized that the "ink spot" at the octopus is a kind of false targets for enemies, distracting their attention.There mollusks another device for protection.Tentacle mollusk grasped enemy may come off.This is due to the strong muscle contractions.For a while detached tentacle continues to respond to tactile stimuli and move.It is yet a further diversion for those who persecute octopus.
Research
for a very long time did not have the exact answer to the question, how many legs an octopus.Biologists more than twenty European centers involved in the study marine life for a long time watching the behavior of octopuses.We analyzed the data of about two thousand.Studies have shown that two feelers are definitely down.Usually, animals move slowly.But in case of danger clams can reach a speed of 15 km / h.The researchers note that the brain sends a signal to the beginning of the movement, the decision about his speed, the nature and direction of each tentacle accept yourself.At the same time, even those limbs that are cut off from the body, continue to take actions that are programmed before.Biologists also been found that the octopus is equally good command of limbs left and right sides of the body.However, preference is given to all third front tentacle - it is intended for presentation to the mouth of food.Each limb has to 10 thousand receptors through which edible or inedible defined object.
Features
find out how many legs an octopus and he uses his limbs, researchers engaged in the study of animal intelligence.Zoopsychology consider these mollusks the most intelligent of all invertebrates representatives.These conclusions are based on practical observations.So, cephalopods have a good memory, be trained, able to distinguish geometric shapes: big from the small, round the square, vertical rectangle from the horizontal.In addition, they get used to people easily recognize those who feed them.If a lot of time to spend with an octopus, it will be tame.These mollusks perfectly teachable.
