The novel’s title, Squirm, evokes the movement of a snake and also the instinctively uncomfortable reaction of people who are unexpectedly forced into contact with reptiles. In the novel, snakes symbolize a source of effective and menacing power, and they relate to the theme of Protecting the Vulnerable. Billy is the character most closely associated with snakes because he is fascinated by them and has learned how to handle many dangerous varieties safely. Aside from collecting snakes as a hobby, Billy uses these creatures to intimidate bullies in all walks of life. Initially, he plants a rubber snake in his locker to keep pranksters from breaking into it. Later, he will use his reputation as a snake handler to scare off the gang of bullies who have been harassing Chin. Ultimately, however, Billy’s skill with snakes plays a pivotal role in bringing down the poacher and antagonist, Baxter. Before Summer and Billy go searching for the poacher at Tom Miner Basin, Billy takes the time to capture a live rattlesnake. He secures its mouth with dissolving tape and puts it in a pillowcase. After discovering Baxter’s getaway helicopter, Billy plants the snake in the cockpit.