I guess spiders can be trained.
https://www.smithsonianmag.com/history/the-cias-most-highly-trained-spies-werent-even-human-20149/
"A few years ago, Bailey was teaching a course on stimulus control for her students. His stimulus was a laser pointer. One day, he was in the bathroom and saw a spider. “I looked down at this spider and said, hmmm.” He took out his laser, turned it on, and gently blew on the spider. “Spiders don’t like wind—it blows their web down,” he says. “They pull themselves down into the smallest size they can get and hunker down.”
Turn on laser. Blow. Turn on laser. Blow. Bailey did this at several intervals during the day. “By the time I finished all I had to do is turn that light on,” he says, and the spider would go defensive. He returned to the classroom where Garrett was lecturing and announced: “You’ve got a trained spider in your bathroom.”