Bill in Alice’s Adventures in Wonderland is a lizard, specifically the character known as Bill the Lizard.
Alice meets Bill in Chapter 4, “The Rabbit Sends in a Little Bill,” after she grows too large inside the White Rabbit’s house. The White Rabbit treats Bill as a practical helper and sends him down the chimney to investigate. Alice’s foot blocks the chimney, and she kicks him out into the air.
Bill later reappears as a juror during the trial of the Knave of Hearts. His pencil squeaks while he writes on a slate, irritating Alice; after she takes the pencil, Bill tries writing with his finger even though it leaves no mark. These small absurdities illustrate Carroll’s comic treatment of bureaucracy and authority.
Bill is sometimes remembered mainly from film adaptations, but the book gives him a larger role across two chapters. He should not be confused with the White Rabbit’s other helpers or with the unnamed animals in the opening chapters. The character’s name and species are both stated through the text and Tenniel’s illustrations.