The horse of 50 million years ago, called the Dawn Horse, was t a little animal the size of a fox terrier. The species had four toes on . each front foot and three toes on each hind foot. Its “toenails” were t little hooves. When this creature lived, there were no grasslands. Its home was the forest, __19__ it fed on tender shoots and leaves. There is proof that this little creature was __20__ of the horse of today. Scientists have excavated fossils of certain animals that lived a few million years later and found that, __21__ they were bigger than the animal of earlier times, they resembled it and the modern-day horse. The horse family survived when many other animals died out __22__ it had two advantages. The little horse was swift, as we can guess from its slim body and slender legs. It also was fairly intelligent; its skull shows that its brain was large __23__ its body.