Many small spiders use silk threads for ballooning, the scientific term for the dynamic kiting [1] [2] spiderlings (mostly) use for dispersal. They extrude several threads into the air and let themselves become carried away with upward winds. Although most rides will end a few meters later, it seems to be a common way for spiders to invade islands. Many sailors have reported that spiders have been caught in their ship's sails, even when far from land.
http://en.wikipedia.org/wiki/Ballooning_(spider)
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