Silky-footed tarantulas don't come unstuck

"To figure out how tarantulas make their way safely up vertical surfaces, Adam Summers of the University of California, Irvine, and colleagues analysed the footprints of Costa Rican zebra tarantulas (Aphonopelma seemanni) as they climbed a glass wall. This revealed that the spiders left fragments of sticky silk a few micrometres in diameter and up to 2.5 centimetres long."