A very popular nonfiction picture book series for young readers. Gail Gibbons is an American writer and illustrator of children's books. With more than 130 titles to her credit. Gibbons is a leader in the field of nonfiction, scientific, educational picture books. Gibbons's simple text, watercolor-and-ink illustrations flow logically from one to the next. The series is for preschool to 2nd grade.