Darwin bark spider - Website 2012

DARWIN BARK SPIDER (Caerostris darwinii)

Named after Charles Darwin, this Darwin bark spider (Caerostris darwini) can build webs that stretch  along entire rivers. The largest discovered so far was 82 feet (25 meters) long. The silk woven by this arachnid architect is twice as strong as any other known spider silk. A similarly sized piece of Kevlar is one-tenth as strong as this spider's silk.

Considering how large the webs are and how strong their silk is, you'd figure this spiders would be massive. But you'd be wrong. Females are no larger than 2 centimeters (less than an inch) in body size and males are five times smaller.