Darwin’s bark spider (Caerostris darwini) produces the toughest biological material known. Its silk has incredible strength and elasticity, making it twice as tough as the average spider’s silk and ten times tougher than Kevlar! Recently discovered in Madagascar, this species is also known for weaving the largest orb webs in the world. The strong silk allows these webs to be weaved above rivers and small lakes, with draglines reaching up to 25 metres across. The orb web, like a giant wheel, can be up to 2.8m2. That’s big enough for a six-foot tall man to fit inside this giant web! But don’t worry. These spiders tend to catch insects like mayflies or dragonflies – not humans.