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How do spiders spin their webs?
How do spiders spin their webs?


To spin a tale about the spider, member of the species arachnid, we must first examine the common thread that ties them together...the way they produce the silk they use to weave their webs, as well as other contraptions, to suit their particular needs.

Spiders differ from insects in that they have eight legs, eight eyes, in most cases, no wings, and have only two parts to their bodies, one of which produces silk. They are found in a host of climates, can scurry across the ground, can scale plants, and can skate on, and live in, water. These factors determine how the spider uses it's silk, and what type of silk it produces.

Production of silk begins in certain glands located in the abdomen, or belly, of the beast. Spinning organs at the tip of the abdomen, contain many tiny holes, and function much as a sieve, through which the silk is pressed. The silk strained through is in liquid form, but immediately takes on a solid form, much like cotton candy does, when exposed to air.

The spider creates a variety of types of silk, each of which serves a separate, yet distinct function. Spiders use the sticky kind to spin webs, to catch and to hold the insects they invite into their parlors until they are ready for dinner. They use the non-sticky, stronger variety to tether down the spokes of the wheel, and yet a different kind of silk for their cocoons.

Even the webs the spider spins differ greatly, depending upon the factors listed above. The most common of all webs we see is the wheel-shaped web. Less common are the so-called "sheet" webs, which blanket surfaces with a funnel, or dome like shape. The trap-door spiders burrow out their webs, and complete them with built-in chutes, through which their unsuspecting guests fall through, right onto the spider's plate. The web we see least often, is the air-tight, bell-shaped home some spiders build...probably because it is completely submerged in water!

Why aren't spiders caught in their own webs?

In short, startled spiders can be entangled in their own webs, in the same manner as their prey. Generally speaking, however, the spider avoids this deadly mishap, by differentiating between the various types of silk it produces, and by knowing its home turf.

When the spider weaves its sticky, insect-catching type of web, it builds into it safety threads of the non-sticky variety, upon which it traverses without being snared. Its nimble, highly sensitive feet orient the spider about its new home, and past the potential pitfalls, to which its prey fall victim. Unless, of course, something, or someone, startles the spider, in which case all bets are off, and the parlor game is over.

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