The Darwin spider, which was only just discovered last year, measures just 2 cm in length, and yet produces the strongest web of any arachnid on the planet. Not only that, the little eight-legged insect can be quite industrious too. The one mentioned in the story for example, has spun more than 25 meters (82 feet) of silk, creating a massive net to ensnare its prey.
Apparently, the Darwin spider builds such massive webs by building in a traditional manner at first, but eventually, when it wants to expand over large distances, it simply fires out long strands of webbing and hopes for the best. Eventually, the sticky-silk will connect with something, and then the little guy starts the engineering process anew. In the case of the spider in this particular story, she fired her webs across a river, and ended up with a large trap to lure in insects as they fly up and out of the water.
All told, the average Darwin spider apparently builds a web that is 2.7 square meters in size, which is about 8.8 square feet. Can you imagine accidentally running into that while walking through the woods at night? *shivers*