Spiders are heterosexual animals. When mating, the male fertilizes the female with seminal fluid, which she saves until insemination in special compartments on the frontal limbs.
The burden of finding the "other half" lies entirely on the shoulders of the male. And at this stage spiders often expose themselves to all sorts of dangers. Hidden and inconspicuous huge part of the day and night, while searching for the female, they, with the risk of personal life, come out of the hiding places, including the day. What is the most important thing, becoming a prey for other animals.
But even afterwards, and after a female is found and fertilized, the threat does not disappear. Most often a female individual kills a male one in order to be used in food. As a consequence, almost all males, anticipating a rapid collapse, are protected by flight.
Duration of life.
In unbridled nature, the average duration of life of animals is from 1 to 2 years. Exception in the given case is considered tarantula spiders living on the average from 3 to 7 years. In family criteria duration increases rapidly and some individuals live to 15 years.
Tempting precedents about spiders.
- The shade is stronger than steel. A layer of net thickness with an unpretentious pencil will withstand the blow of an airplane.
- Till now it was not possible to reproduce analogue of a network in laboratory criteria.
- From a stage of own origin on the ground, spiders literally did not evolve. An individual of a separate appearance, born millions of years ago, will be similar to the structure of a progressive spider.
- The set of food used by spiders for a year, surpasses total weight of all human population of the earth.
- Spiders are ready to replace sexual orientation, in case they do not find a partner of the opposite sex.
- Some female appearance reminds us of spiders with whom they crossed many years ago. And, after years, have every chance to recognize them.
- Fear of spiders (arachnophobia) goes into the 10 most common phobias in the world.
- For human poison most spiders are not dangerous.
True, spiders are the only and inimitable animals in their family. Someone is afraid of them, someone is naughty, and someone gets them as family animals. Their fame grows with any year, and to introduce a spider's favorite, instead of a traditional puppy or a kitten, more and more people are dreaming.
Can Spawn Spiders Swim?
Navigators and explorers like Charles Darwin have often been aware of "air spiders" flying in the air close to the sails of their ships, far from the shore.
Migrating spiders use silk threads to stay in the air, but what happens when they accidentally land on the water?
In the beginning, it was expected that they actually drowned, but, as it turned out, spiders for example are not bad in navigation, as well as in flight.
It was like an illusion," Morito Hayashi of the English Museum of Science says, "and he was the first to notice how spiders swim in the laboratory. He studied the flight of spiders, trying to find out how they soar when he noticed this unusual appearance at one point. "I was extremely surprised that these ordinary spiders, which can be found in any garden, for example, can swim perfectly.
"The most unusual thing is that no one expected them to behave like that," says Sarah Gudakr, a colleague from the Nottingham Institute.
Some spiders create silk net diving bells to wind under water, others have every chance of catching and eating fish.
However, until now, no one knew that ordinary spiders actually have all the chances to swim, most quickly due to the fact that these images are quite small and achieve a length of only a few mm.
"It has always been that water is the most serious obstacle to the settlement of appearance," says Gudakr. "Now we know that they have every chance to endure all the hardships in the water and, accordingly, to spread over much greater distances than previously expected.
To recognize how they do it, Gudakr, Hayashi and their colleague studied the possibilities of bathing 325 spiders of 21 shapes caught on islands, in ponds and lakes, chosen by chance, and in all kinds of Nottingham reserves.
In the laboratory, they placed spiders on separate trays of water and then used small pumps to expose the spiders to weightless jets at a rate of 3 to 80 centimeters per second.
All the spiders were able to withstand the water, thanks to the ability of their feet to repel the water.
And 201 of them have proven their ability to swim.
The bulk of them tried to move along the water plane, forming "sails" from various parts of the body. Some raised their front legs in the shape of a letter V, others pulled up their abdomen to the sky, which is actually equivalent to a handstand.