The largest web in the world belongs to Darwin’s bark spider from Madagascar. It weaves its gargantuan trap over entire rivers and lakes. The main thread can be as long as 25 metres and the sticky core can be as large as 2.8 square metres. Darwin’s bark spider also uses the toughest silk of any species. It’s twice as elastic as any other spider silk and it can resist 10 times more force than Kevlar before rupturing. It’s not just the apex of spider silk – it’s the toughest biological material ever found.