McCook never found proof of how wind-facilitated travel works. Almost a century later, William Eberhard, a scientist at the Smithsonian Tropical Research Institute in Panama, captured spiders of 65 different species and studied their strategies. He saw that some release a "bridging line" into the breeze and wait for it to snag on a branch or stone. Once the line catches, the spider reels in the slack until the line is taut enough to creep across. McCook measured a strand that spanned 26 feet, clear across a country road. The record holder, Caerostris darwini, or Darwin's bark spider, lives in Madagascar. Its silk stretches across lakes and rivers more than 80 feet wide.