Beef cattle originated in the forests of Europe. Bison have been in North America for at least three hundred and fifty thousand years and in that time they have adapted to the weather, the plants, and most of the parasites. They process native grasses better than cattle, they don't have trouble calving, and a late spring blizzard is a minor annoyance to them instead of a life or death affair.
Not only are the animals majestic but the meat is superb. With less cholesterol than skinless chicken and 70% less fat than beef, you can enjoy a T-bone steak without damaging your health. Bison are not raised with hormones, steroids, or antibiotics like modern cattle. Though the research is preliminary, it appears that bison meat is also high in Omega 3 fatty acids. People who raise bison are going out of their way to ensure that no animal products are fed to their animals. No bison has ever demonstrated BSE, or "Mad Cow" disease. Put succinctly: Bison meat is good for you.