When do cobwebs become cobwebs
|This is how a bike network is built!|
|Ravens can also jump, but are therefore not called jumping ravens|
Only half of the spider species build a web to catch prey. Other species of spider build a web that they only use for living or other purposes. The weaving of the webs is different depending on the species of spider.
To weave their webs, the spiders produce filaments in their spinnerets. These threads come out of the spinnerets on the abdomen and consist of a substance that hardens in the air. Depending on the type of thread (safety, spinning, tripping, adhesive ...), the thread is of different thickness, elastic and firm.
The spiders inherit the gift of weaving a web from their parents. As different as the individual species of spider are, so are the webs they spin. The simplest imaginable web is just a tube in which the spider sits. Some nets are triangular, other times it is just a single thread, interspersed with thick fishing wool, in which the prey becomes entangled.
Much more ornate is the classic spider web we all know, namely that Wheel network. In order to catch the prey, the spider attaches a so-called signal thread to its orb web. At the end of the signal thread, it patiently lurks for its prey. If an insect gets caught in the web, the spider hurries quickly along the signal thread to its prey, bites the insect, spun it in with threads and returns to its sentry post. The insect is paralyzed by the bite and is often sucked out for hours.
There are spiders who weave a blanket of threads under which they hang upside down. These spiders will Canopy spiders named after one of its representatives, who also occurs in Luxembourg: the canopy spider. When hunting, they do not use sticky threads, but so-called “stumbling threads” as an alarm bell that they attach to their net. If a prey stumbles over one of these threads, the spider can recognize the direction from which the movement is coming. The spider bites its prey through the ceiling, which is then quickly pulled through the web to the underside.
Then there are spiders who build something like a funnel out of threads in the ground or in the bushes. The insects that run over this funnel do not stick, but are, similar to the ceiling net, prevented from moving by numerous tripping threads.
Some spiders don't stay in one place and hunt without a web, they just pull a safety thread behind them, which they use as a safety rope, like climbers. This is how the zebra spider from the family does it Jumping spiders: you can see them in the villages on sunny walls and window sills. When it sees a prey, it runs towards the prey, attaches a safety thread to the ground where it is hanging, and jumps on the victim to bite it. So she always has a hold in case she slips. The jumping spiders have well developed eyes because they aim well when jumping and therefore have to see well.
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