Four Acre Spider Web Engulfs Building

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The Baltimore Wastewater Treatment Plant put out a call for “extreme spider” help in 2009, when a giant spiderweb covered almost 4 acres of their facility. Scientists eventually estimated over 107 million spiders were living in the structure, with densities of 35,176 spiders per m³ in spots.

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In some areas of the plant over 95% of space was filled with spider web. The webbing was so dense that it pulled 8-foot long fluorescent light fixtures out of place.

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The scientists described their estimate of 35,176 spiders/m³ as “markedly conservative” and “representing a minimum volume” of spiders, by the way.

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