Exotic crab

Many types of crabs, usually grown in freshwater, known as Crab, growth in the ocean known as crab. Green as a delicacy in seafood has been well known, but many of us do not fully understand.

The first is a renewable crab body function. Crab 10 limbs are born "broken line." If a limb by "enemy" bite, or injured or trapped in stone rapidly, it has a special muscle contraction immediately, cut off the limb. Broken limbs not to the bloodshed, as limbs with special membrane, nerve and vascular completely closed. There was a special "gate" can be closed off the blood cells to produce proteins and grow new limbs began.

In addition, crabs are a very special "Compound Eye", could reach 180 ° angle. "Compound Eye" feel connected to a below Eyestalk, hidden in a hard shell socket, two can be extended outward respectively. If a bad eyes, will soon grow a new eye. However, its eyes and Eyestalk If all damaged or severed, can no longer grow new eyes in orbit only in a long tentacles. Crab renewable capacity with a number of other animals, like the ability to regenerate the body, scientists are striving to explore the mysteries and would like to untie them problems.

Another crab specific functions, in addition to the mouth and Xieao sophisticated, the other eight "legs" to have "debate style" skills. In 1930, biologists will be performed on a crab, the paper has several sucked into the gravy, this is the last one pair of crabs "legs" encountered gravy, immediately seized and begin feeding.

Australian scientists on a sand crabs bubble after years of observation and study found that of previous scholars believe it - foot section of the film may be hearing the disc, and confirmed by experiments, it is this peculiar enough to breathe. Foot in the film is a complex vascular system, which will oxygenated blood and non-delivery of oxygenated blood exchange.

It was also found that the crabs "legs" is very sensitive and aware of the water can be a shock, the first pair of "legs" can detect objects very far away and liquid turbulence. Crab five pairs of "legs" to the hidden complexity of our current system is unknown.

Many crabs are in a "clock" can have a museum of color changes. Biologists found that crab body red, white and three black pigment. During the day it spread a red shell, two black pigment to color comparison Oh museum. At night, these pigment faded, the colors become On crabs. The biological significance of these changes have yet to be revealed.

Some of the crabs in underwater objects to the use of polarized light and the means to determine the direction of future actions. Some scientists experiment proved, North America and South America waters common crabs, if left to its original habitat, can return home to find direction. They only at the dark clouds in the sky when it lost direction and operations remain unchanged.

In 1960, biologists discovered that the crab arterial blood pressure 20 times lower than humans. Because of the arteries, hypertension crab not, and never will die of heart disease. To help blood circulation, some crab gills underneath another auxiliary heart.