Subject(s): Pigeons -- Juvenile fiction. | Emotions -- Juvenile fiction. | Commencement ceremonies -- Juvenile fiction. | Graduation (School) -- Fiction. | Juvenile fiction -- Social Themes -- Emotions & Feelings | Juvenile fiction -- Animals -- Birds | School -- Young reader -- Collectible -- Graduation -- Bestseller -- Comedy -- Favorite Character -- Pigeon -- Humor -- Award -- Celebration -- Diploma -- Bestselling -- Kids -- Gift -- Funny -- Mo Willems -- Childhood | Animal fiction. | Picture books.