World's largest, strongest spider webs

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This massive spider web in Madagascar was woven by Darwin's bark spider, a recently-discovered arachnid that uses its incredibly-strong silk, ten times tougter than Kevlar, to make the world's largest webs. These spiders are known to make orb webs in Andasibe-Mantadia National Park up to 2.8 meters square anchored by 25-meter threads. More photos at National Geographic, and the scientists' reports in PLoS ONE.