"Many species of spiders use air transportation to disperse their young. On a sunny, windy day a spiderling ready to make its way in the world climbs to the tip of a twig or grass blade, raises its abdomen, and spins a thread of fine silk. When this silken lifeline waves six to ten feet into the air and is caught by the wind, the spiderling releases its hold and is carried away, ballooning into the sky. The journey it takes can be long and lofty. Spiders on gossamer threads have been captured more than five miles above the ground. Others have descended into the rigging of ships hundreds of miles from the nearest land."