In the mid-19th century, before they were pushed to the brink of extinction, there were between 60 and 100 million American Bison in the U.S. There are an estimated 350,000 American Bison in the wild today, located primarily in a few national parks and other reserves. There are currently about 100 million cattle in the U.S. Using the notion of property rights, can you explain why these populations are so different?