A documentary about spiders
The spiders are arthropods with four pairs of legs and cheliceras (knocks) in which the mouth of the venous gland. They are the largest order of arachnids with high species diversity. Spiders are found on every continent except Antarctica and in almost every environment, except air and sea.
2017 46 species and 410 spider families were recorded with 109 in January. In the Czech Republic, 879 species have been recorded, of which 27 is considered extinct in the Czech Republic and other 483 is in a different degree of threat according to the third edition of the Red List of Spiders of the Czech Republic.
Anatomically spiders from other arthropods differ in that they usually have the body divided into two tags (functional units), the main shaft and the butt that are connected by a small cylindrical stem (pedicle). Unlike insects, they have no antennae. In addition to the most primitive group of Mesothelae, the spiders of all arthropods have the most centralized nervous system, because all their ganglia (nerve lymph nodes) are located in one place in the head. Unlike most of the arthropods, they do not have almost any extensors in their limbs, and instead they are stretched by hydraulic pressure.
The spinal limbs of the spiders have evolved into a mating nipple producing spider webs up to six types of mumps that are found in the buttocks. Cushions can vary in size, shape and amount of sticky fiber used. Ringworms appear to be one of the older spider webs. Spiders making spider webs are more widespread and more diverse than crusaders (who are creating circular spiders). Spiders like arachnids with organs producing cobwebs appeared in the devon some time before 386 for millions of years, but these animals lacked the nipple nipples. True Spiders have been found in Carboniferous rocks, dating back to the 318 to 299 period for millions of years, and are very similar to the most primitive living subordinates, the Carpathians. The most prominent groups of modern spiders, Mygalomorphae and Araneomorphae, appeared in the Triassic 200 trillion years ago.
In 2008, food specialties of Baghera kiplingi,  were described, but all other species are predators. They live mostly insects and other spiders, although several large species also catch small mammals, birds and reptiles. To hunt spoils spiders use different strategies: they catch it in sticky webs; the sticky fibers shed her; they imitate it, not to reveal them; or her. Most of them prey reveals by vibration, but active hunters have good eyesight. Portia Hunters show signs of intelligent behavior when choosing hunting tactics and the ability to create new ones. Spider veins are too narrow to accept solid food, so they digest it with digestive enzymes and crush macadamas (pedipalps) because they have no right jaws.
The males are alerted by various harvest rituals so that the females do not eat it. The males of most species survive several mating and die for other reasons than the females would eat them. Female cobwebs produce cocoons for eggs, each of which can contain up to hundreds of eggs. Females of many species take care of their offspring, for example by wearing them or sharing them with food. A small part of the species is social and creates common webs that can serve as few as 50 000 individuals. Social behavior ranges from cautious tolerance to common hunting and sharing of food. Although most spiders live for a maximum of two years, goblins can live in captivity for up to 25 years.
Although poison of some species is dangerous to humans, scientists are investigating the potential use of spider poison in medicine and agriculture (as a non-polluting pesticide). Spiderweb represents a better combination of lightness, strength and flexibility than artificial materials, and scientists have tried to insert genes that produce these fibers into DNA of different mammals and plants to see if these organisms can produce fibers. Because of their diverse behavior, spiders have become a symbol of patience, cruelty, and creativity in art and mythology.