Have you ever looked at a horse and wonder how we got to the modern horse we have today? Imagine a world where there were horses of all colors, sizes, shapes were roaming the earth, but was no bigger than a size of a dog. Today’s horses only represent a fraction of the horse family tree, known as Equine. All the other branches of horses called Equidae are now extinct. The Equid family appeared 55 million years ago, in North America, which branched off into different genera such as grazers, left browsers, and mixed feeders. Today the Equid family is only represented by Equus genus, that is composed of seven to nine species, including zebras, asses, donkeys, and horses. These species are also in the order Perissodactyla, or odd-toed animal. Tracking the line of descent from Hyracotherium to Equus reveals several evident patterns: degradation of toe number, increase increment of molar teeth, extending of the face, and growth in body size; but these patterns are not found in all the horse lines.…