Mercer Mayer (born December 30, 1943) is an American children's author and illustrator. He has published over 300 books, using a wide range of illustrative styles. Mayer is best known for his Little Critter and Little Monster series of books.
When new neighbors move in, Little Critter hopes they have kids his age. But when their kid turns out to be a girl, Little Critter is very disappointed.