1 Symptoms of kidney pain may include. 2  fever, 3  painful urination, 4  flank pain, 5  nausea and/or vomiting. 6  Kidney pain can be on the left, right, or both sides.
A Brief History of Horses. By 55 million years ago, the first members of the horse family, the dog-sized Hyracotherium, were scampering through the forests that covered North America. For more than half their history, most horses remained small, forest browsers.
Wikimedia Commons. Modern horses have come a long way since their prehistoric ancestors roamed the grasslands and prairies of Cenozoic North America. On the following slides, you'll find pictures and detailed profiles of over a dozen prehistoric horses, ranging from the American Zebra to the Tarpan.