A bison in Yellowstone%2C descended from a small number of genetically-pure survivors that found refuge in the national park following the annihilation of 30 million in the American West.  What%27s the value of keeping a species alive beyond economics and ledger sheets%3F  Photo courtesy Jacob W. Frank%252FNPS
A bison in Yellowstone%2C descended from a small number of genetically-pure survivors that found refuge in the national park following the annihilation of 30 million in the American West. What%27s the value of keeping a species alive beyond economics and ledger sheets%3F Photo courtesy Jacob W. Frank%252FNPS