Lately I have seen a number of spider webs [really, it looks like a single strand] running horizontally from one tree to the next. This morning I saw one over fifteen feet long, nearly perfectly level, and suspended abouty eight feet above the ground. How does a spider span the fifteen feet from limb to limb? One day I was walking down and saw what appeared to be a twig floating in mid air, right at eye level! Only when I got close could I see the web. This was a twig about six inches long, and had at least a 3/16" diameter - relative to bugs and moths it was quite heavy - so the silk is surprisingly strong. It is also very thick as compared to most silk seen in other webs.