A fellow I met in the Air Force told me of a time when he was on a pacific island and he and his friend were taking turns riding a mini-bike. He ran into something that knocked him backwards off the bike. He thought it was a volleyball net, or something like that, stretched across the trail. He looked up from the ground and saw it was a giant spider web about 8 to 10 feet across, really thick strands and there was a HUGE spider right over him. He said the spider, with legs, was larger than his hand with the fingers outstretched. It is called a bird spider and eats, you guessed it, birds that it catches in it's enormous web. I couldn't believe a web could knock him off the mini-bike, but he swore it was true.