After about four or five minutes of breathing carbon dioxide gas, Caitlin Creak’s eight-legged subject is fully unconscious. Working quickly—she has less than a minute before the spider, named Harold, starts to wake up—Creak pins the creature’s legs under a foam doughnut, leaving the shiny black body exposed. Using an especially strong super glue, she attaches a tracking device, barely larger than a grain of rice, to his back. The next day, she’ll release Harold near where she found him on the outskirts of Sydney, Australia, and study his movements…
