"In a report, Adam Summers of the University of California said: 'In addition to these tarantulas, if we can also find other types of spiders with the ability to secrete silk from their legs, then our various hypotheses about the evolution of spider silk should be significantly revised. This means that spider silk first originated in the legs to enhance friction and then gradually evolved and developed into many... Ge Bo and his colleagues have been focusing on studying the zebra wolf spiders in Costa Rica. Their research results have been published in the journal Nature, stating that they let these striped, furry spiders crawl on vertical glass plates..."