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spider silk
Spider silk is a protein fibre spun by spiders. Spiders use their silk to make webs or other structures, which function as nets to catch other animals, or as nests or cocoons to protect their offspring. They can also use their silk to suspend themselves.
Many small spiders use silk threads for ballooning, the popular, though technically inaccurate, scientific term for the dynamic kiting〔(Spider By Ann R. Heinrichs. Google Books. ) She observes that the so-called ballooning is like a kite or balloon; she is mechanically correct about the kite part, as no true balloon is ever formed by the Spider as told in the other references.〕〔(Flying spiders over Texas! Coast to Coast. Chad B., Texas State University Undergrad ) Describes the mechanical kiting of Spider "ballooning".〕 spiderlings (mostly) use for dispersal. They extrude several threads into the air and let themselves be carried away by winds. Although most rides will end a few yards 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. The extremely fine silk that spiders use for ballooning is known as gossamer.〔''Oxford English Dictionary''.〕
In some cases, spiders may even use silk as a source of food.
Methods have been developed to collect silk from a spider by force.
==Biodiversity==
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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