A Field Guide to Yellowstone and Grand Teton National ParksThe essential nature guide to Yellowstone and Grand Teton National Parks, written by a local wildlife biologist and eco tour guide. More than 1,200 color photographs with concise descriptions reveal the richness of the Greater Yellowstone Ecosystem. This is the definitive field identification guide to the region's rocks, minerals, geysers, waterfalls, mushrooms, trees. wildflowers, insects, amphibians, reptiles, fish, birds, mammals, tracks and scat,