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Spiders are some of the most efficient hunters of the animal kingdom, no less feared than the shark, the cheetah or the wolf. An orb-spinning spider puts its elegant traps together pretty quickly. It begins with a single thread, which forms the basis of the overall structure, and proceeds by constructing a bridge. For this, it climbs to a suitable starting point (up a tree branch, for example), and releases a length of thread into the wind. As the free end catches another support, it walks across it and completes the bridge. The spider then releases a looser thread below the first one and slowly climbs to its center. The looser (second) strand sags downward, forming a V-shape. The spider then lowers itself from this point to form a Y-shape, thus completing the core frame of the frame. Wit
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