Crayfish are orderlies of the environment in which they inhabit. Most crayfish, including hermit crab, inhabit the seas and rivers, but among hermits there are not only deep-sea, but also land species.
Medics crayfish are called because they are omnivores.Juveniles live in the ebb and flow zones, where it is easier for them to find food. Among the algae they collect all the carrion, including the remains of animals. They eat like real gourmets: slowly, they bite off a small piece with the claw and eat it.
One female can postpone during the year tofifteen thousand eggs. It fastens the testicles to its abdomen and takes care of them, constantly raking up fresh, oxygenated water streams to the abdomen. Days after ten of the eggs appear the larvae, which have to go through four stages of growth.
The body of all young crayfish is covered with densearmor. It is impossible to grow in it, therefore, from time to time young crayfish shed their armor and, having increased in size, are again covered with a new shell. On the fourth molt, the hermit crab loses part of its shell in the abdomen forever. Its long belly is covered with skin, bends under the breast and takes the form of a shell.
As if ashamed of such shame (at the same timefearing to become the prey of other crayfish), the hermit crab searches for a comfortable shell thrown by mollusks and shoves its soft abdomen into it, and leaves its head and claws outside, but only until the danger appears. In case of danger, he is all wedged into the shell and covers the entrance to it with his right claw covered with thick shell, the good thing is that the structure of the hermit's cancer allows him to sit comfortably in the shells of any configuration.
Other types of crayfish continue to shed andgrow. They live compactly. But hermit crabs are the exact opposite. They are loners. But meanwhile they love the company of other creatures. For example, deep-sea hermits allow to live on their shells amazing and very poisonous fish - sea anemones, therefore their shells seem shaggy. Cancer willingly runs in a shell with actinia and feeds it with the remnants of its food. Although poisonous sea anemone often causes the death of a predator targeting a cancer that lives in a shell. And then eats it along with cancer. Overseas singles make it possible in their "houses" to house a polychip worm, creating such a unique hostel, which gives both shelter and protection from predators. The worm does not allow annoying insects into the shell, and the cancer protects the worm from amphibians of predators.
The digestive system of hermit crab is veryinteresting. From the mouth, through the pharynx and esophagus, its food enters the first section of the stomach, equipped with serrated chitinous graters. The ground food enters the second section, where it is filtered and enters the intestine, passes the digestive gland, where it is digested. Hermit crab breathes gills associated with his limbs. The eyes have a very complex structure, as they consist of many separate optical lenses, assembled in one eye, so his vision is mosaic.
