Ann Simpson & Rob Simpson 
Nature Guide to Yellowstone National Park 

This field guide dedicated to wildlife of Yellowstone National Park is an information-packed, pocket-sized book that introduces park visitors to the animals, plants, insects and more that reside in Yellowstone National Park in a colorful and portable package. Published in cooperation with Yellowstone National Park Association, this Nature Guide to Yellowstone National Park contains full-color photos and easy-to-understand descriptions. Here is the perfect companion guide for the 3 million visitors who travel to Yellowstone National Park every year.