Have you ever heard the expression “when pigs fly?” It is a saying people use to express that something is very unlikely to happen as unlikely as pigs growing wings and flying like a bird! For example, a person who hates riding roller coasters might tell a friend: “I’ll go on that ride with you when pigs fly.” Well, one pig in San Francisco may not be flying. But she is helping people relax before they fly in a plane. LiLou is a small pig working at the San Francisco airport. She is a therapy animal. That means she is calm and likes to be touched by humans. She and other therapy animals aim to help travelers who get nervous about flying in planes. She was trained by the Society for the Prevention of Cruelty to Animals (SPCA). This is LiLou’s first week on the job as a member of the airport’s “wag brigade.” She only works at the airport once a month, so not all travelers to the San Francisco airport will see her. But you might see some of her fellow therapy animals.