James C. Halfpenny, Ph.D., is a scientist / tracker / educator who directs A Naturalist's World, an ecological education company located at the north gate to Yellowstone National Park. A Naturalist's World maintains the Track Education Center which houses over 10,000 footprint casts, photographs, and track accounts. Jim has been tracking for over 50 years and has tracked on all continents. He specializes in rare species including all carnivores. Other interests are ecology, especially of cold regions, and winter.