Once upon a time, before whites came to North America, there were billions of buffalo wallows dotting the land. Today, most North Americans have never even heard of a buffalo wallow.... When I was young, growing up as a farm girl in Iowa, I rode my horse Sundance in the vast Des River Valley in central Iowa. Although most of Iowa is flat prairie, I was lucky enough to live only a half mile from this magnificent river valley, marked by rolling hills, oak savannahs and heavy forests. In this...