Charlotte A. Cavatica, a spider, lives in the space above Wilbur's sty in the Zuckermans' barn, she makes friends with Wilbur and chooses to help stop him being eaten. With the help of the other barn animals, including a rat named Templeton, she convinces the Zuckerman family that Wilbur is special by spelling out such descriptions as "Some Pig" in her web.