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The genus Argiope includes rather large and spectacular spiders that often have a strikingly coloured abdomen. Whats even more interesting is the spiders Web !!! Their webs have something very peculiar called as the Stabilimenta.(the zig zag decorations on the web ) the stabilimenta serve many purposes .... Stabilimenta may serve as camouflage, an idea that is bolstered by the fact that they are constructed only by spiders that typically sit in the hubs of their webs, out in the open. Camouflage would be helpful in concealing the spider's presence from visitors who would like to avoid them, as well as in preventing predators from spotting an easy meal. The stabilimentum may also serve as a warning to birds, to keep them from flying into the web. This would reduce the need to rebuild or repair the web. On the other hand, it also makes the web more obvious to those birds who are fond of eating spiders... The silk used to make the stabilimentum has been shown to reflect ultraviolet light very efficiently. As a result, this part of the web would be highly attractive to insects, luring them to its threads.
Check out the phantom Mask On the abdomen !!!!