Whitney Sanderson is the author of many books for young readers, including books in the Horse Diaries and Unicorns of the Secret Stable series. She lives with her family in Massachusetts. Her website is www.whitneysanderson.com.

Horse and Zebra are best friends, but they couldn't be more different! While Horse is steady and sensible, Zebra is zany and creative. But what they have in common is that they will always look out for each other, and they're always ready to help another animal in need.