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Tinga_2012 05 20_0982 Image by HBarrison Darwin's bark spider (Caerostris darwini) is an orb-weaver spider that produces one of the largest known orb webs; its silk is the toughest biological material ever studied, over ten times tougher than a similarly-sized piece of Kevlar. This Mpumalanga South Africa image was automatically curated and published with WP Robot plugin … [Read more...] about Tinga_2012 05 20_0982