Many spiders suspend complex webs across gaps in branches, rocks and buildings in order to capture insects. Construction of these orb webs begins with just a single thread. In order to get the first thread from one side of a gap to the other, the spider lifts its silk-producing spinnerets into the air, enabling the thread to be caught on the breeze.
The fine silk is easily snagged on branches, becoming caught and providing the spider with a bridge. The spider then builds the radial threads, extending outwards from the centre like the spokes of a wheel. For the sticky spiral, the spider first traces the outline with a guide rope of non-sticky silk and uses its legs to measure the correct distance.