The spiders rest their legs on different lines on the web that way they can feel the movement of something caught inside the web somehow they are able to tell the difference between prey that has been captured and merely the wind moving the web.
I tried a few times when I was a kid tricking what we call Banana Spiders but they never seemed to get fooled by my fake movements of the web.The Banana spiders make a huge web that has a very sturdy center their silk is very strong and sticky even in thinner areas the webs are often 7 or 8 feet high I bet that a small bird would be unable to get out of the web if it got caught though I have never seen evidence of it actually happening.
I was viewing some show a few weeks back on National Geographic they where in Texas and they where looking at this massive web like the one in those trees in the op picture but in this case it was covering one very large oak tree it was much larger than the webs in the op photo.
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