BIRDSFeathered Friends

How are spiders able to build webs across large open spaces?

When I’m walking to the shops I go down an alleyway approximately fifteen feet wide with no overhanging structures and no vegetation or trees within sight- just two featureless wooden fences either side and concrete on the ground.

I always walk through a strand of spider web; assuming the spider isn’t some sort of eight-legged Evel Knevel, with a very small motorcycle to make the jump, how are they able to get their webs to do this?

At the back of a spider, the large body section, it has eight openings, called spinnerets. Each one of these releases a different kind of silk. Spiders actually produce non-sticky threads so they can walk on them. Two, maybe three of these spinnerets have the non-sticky type. A spider lifts its body section skywards and releases threads that catch on the wind, even a small breeze is sufficient. On contact with a surface the spider pulls the surplus in, creating a taught rope across any ravine-or footpath. The spider crawls across this suspended thread towards the middle and repeats the process again. It may do this several times until it has required the outline of its intended web. Along one of these threads, the spider will crawl along, using its body length as a guide, then affix the trailing thread in an anti-clockwise direction. It repeats this process until it has completed a spiral of non-sticky thread in a large sweeping spiral, finishing at the outer edges. it then uses this as a guideline to add the sticky thread in between, going in ever decreasing circles to the centre.
Then some clumsy idiot walks into it and the spider has to start again!.

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