why does a spider spin a web
If you've ever seen a new home being built, you know that the workers use wooden boards to frame the house. Instead of boards, spiders produce
threads to build their webs. The is produced in glands with the help of the spider's spinnerets. Spinnerets are special organs that allow the spider to decide what type of it needs for the web. The threads can be thick or thin, dry or sticky, or smooth. The threads a spider uses to construct its web begin as liquid, but they dry quickly in the air. Spider webs are quite. How do spiders learn to make such complex patterns?
Making webs is for spiders, which means nobody has to teach them how to do it. They are born knowing how. When a spider begins a web, it releases a. It anchors the to some object в a branch, a corner of a room, a doorframe в wherever it builds its web. As the spider moves back and forth, it adds more threads, strengthening the web and creating a pattern. Lines that go from the center of the web outward are called " lines. " They support the web. Threads that go around and around the web are called " lines. " So why do spiders spin webs?
When you need food, you go to the grocery store. When a spider is hungry, it heads to the web. The main reason spiders spin webs is to catch their dinner. When an insect, such as a fly, flies into a spider's web, it gets stuck on the sticky threads. When a spider catches in the sticky strands of its web, it approaches the trapped insect and uses its fangs to inject. The either kills or paralyzes the, allowing the spider to enjoy its dinner in peace. Not all spiders use webs for food, however. Some don't build webs at all.
Other spiders chase their. Some even make sticky nets, which they throw over their when it gets close enough. Spider webs are designed to do one thing: catch prey. The size, design, location, and orientation of the web all conspire to capture certain kinds of prey. Not all webs are sticky. Some are made of tangled silk charged with static electricity. БLadderБ webs built by some tropical orb weavers are designed to catch moths. A moth impacts the top of the web, but its slippery wing scales allow it to roll off. The spiderБs web is so long, however, that eventually the moth loses most of its scales and is eventually stuck by the time it reaches the bottom of the web.
Net-casting spiders in the family Deinopidae suspend themselves over БtrailsБ frequented by insects, and hold a small rectangular web between their front two pairs of legs. When an insect passes underneath, the spider launches itself like a bungy-jumper, sticking the bug to the web and yanking it off the ground. Spiders can even be identified, in many cases, from the kind of web they weave.
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