There are 32 pages in this book. This is a picture book. A picture book uses pictures and text to tell the story. The number of words varies from zero ('wordless') to around 1k over 32 pages. Picture books are typically aimed at young readers (age 3-6) but can also be aimed at older children (7+). This book was published 2006 by HarperCollins Publishers Inc .

HOLLY KELLER has illustrated many popular science picture books, including Growing Like Me by Anne Rockwell and Air Is All Around You by Franklyn M. Branley, as well as several previous Green Light Readers. She lives in New Haven, Connecticut.