The story is a deep history of horses. Starting with Hyracotherium, who was the first species of horse after dinosaurs became extinct. Horses evolved throughout millions of years. Scientists can get an accurate depiction of their evolution through fossils that are still being found today. Equus is the modern horse and it evolved about five million years ago. After giving a brief history of Equus, the book talks about the different breeds of horses that encompass the world today on six continents. Each horse has characteristics that are unique to where it lives. The book was very informative and had several details about horses. The articles went in depth about horses and the information was very interesting. This would be a good book to write about horses for a science report.