* Durable, inexpensive, fun to use nature identification guide * Great for families, hikers, and park visitors * Created by a high-school science teacher This field guide for Yellowstone National Park is easy to stash in the car or slip into your pack. No matter the weather or terrain, Mac's Field Guides are the perfect wildlife identification tool for the amateur naturalist, covering a wide variety of subjects and regions in North America. More than 1 million Mac's Guides have been sold! Other titles in the Mac's Field Guide Series include: Mac's Field Guide to Acadia National Park Mac's Field Guide to Alaskan Wildlife Mac's Field Guide to California Coastal Birds Mac's Field Guide to California Coastal Fish Mac's Field Guide to California Coastal Invertebrates Mac's Field Guide to North American Birds of Prey Mac's Field Guide to North American Dinosaurs Mac's Field Guide to North American Freshwater Fish Mac's Field Guide to North American Land Mammals Mac's Field Guide to North American Marine Mammals Mac's Field Guide to North American Reptiles Mac's Field Guide to North American Salmon & Trout Mac's Field Guide to Northeast Coastal Water Birds Mac's Field Guide to Northeast Coastal Fish Mac's Field Guide to Northeast Coastal Invertebrates Mac's Field Guide to Northeast Park & Backyard Birds Mac's Field Guide to Northeast Wildflowers Mac's Field Guide to Northern California Park & Garden Birds Mac's Field Guide to Northern California Wildflowers Mac's Field Guide to Northwest Coastal Water Birds Mac's Field Guide to Northwest Coastal Fish Mac's Field Guide to Northwest Coastal Invertebrates Mac's Field Guide to Northwest Coastal Garden Bugs Mac's Field Guide to Northwest Coastal Park & Backyard Birds Mac's Field Guide to Northwest Trees Mac's Field Guide to Pacific Northwest Wildflowers Mac's Field Guide to Rainier National Park Flowers & Trees Mac's Field Guide to Rainier National Park Mammals & Birds Mac's Field Guide to Rocky Mountain Wildflowers Mac's Field Guide to San Juan Islands Mac's Field Guide to Southern California Park & Garden Birds Mac's Field Guide to Southern California Wildflowers Mac's Field Guide to Southwest Cacti, Shrubs & Trees Mac's Field Guide to Southwest Park & Garden Birds Mac's Field Guide to Yellowstone & Grand Teton National Parks: Trees & Wildflowers Mac's Field Guide to Yosemite National Park: Birds & Mammals Mac's Field Guide to Yosemite National Park: Trees & Wildflowers Craig MacGowan has taught marine science to high school students for more than twenty years and is responsible for developing the Seattle school system's marine science program. He first created his field guide cards as a teaching tool.