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Why only female Darwins bark spiders weave the toughest webs

The Darwins bark spider, found in the forests of Madagascar, weaves silk that outperforms steel and most human-made fibres in both strength and toughness. Its silk has a tensile strength of about 1.6 gigapascals, around 3x higher than that of iron, making it the toughest biological material ever tested

21 Jan 2026 5:30 am