This book traces the evolutionary lineage of the modern horse, exploring its extinct ancestors and its wild relatives. The author, Kelly Milner Halls, draws upon paleontological and biological evidence to present a comprehensive overview of equine history. The book aims to educate readers about the diverse family tree of horses, zebras, and asses.

The book is presented as an informative exploration of equine evolution and diversity. Its focus on extinct ancestors and living wild relatives suggests a comprehensive approach to the subject. The material indicates a text likely aimed at readers interested in natural history and animal science, providing a factual account of the horse family's development and current status.