Excellent book about the Greater Yellowstone Ecosystem

One of the best books about the natural history of the Yellowstone ecosystem is For Everything There Is a Season: The Sequence of Natural Events in the Grand Teton-Yellowstone Area by Frank C. Craighead Jr.

From a review at Amazon.com: "With an almost poetic passion (but minus sentimentality), Frank shares with us the intricate details of biotic life in the Grand Teton-Yellowstone ecosystems---what "events" occur coinstantaneously and may signal the occurence of what OTHER events, within each given season and "subseason". His knowledge of these interrelationships is transfixing to the amateur naturalist (like myself!), and inspiring. The flow of Life itself brims from this book. And while he could easily hoard such choice hints as where and when to find morel mushrooms or certain rare flowers, he doesn't: He is generous in trusting his readers to not harm the biota they discover via his book. A better homage and resource book for this region could not be found."