Chronicles historical events and changes in Wood Buffalo National Park and the Peace-Athabasca Delta. The study was an important landmark in the long history of bison investigations, and came at a time when the future of the bison was again the subject of intense debate. This is the only in-depth study of a predator-prey system that once dominated the mid-section of the continent. The complexity of the modern management dilemma and the importance of thorough ecological investigations are clear from this account.