This waterproof guide beautifully illustrates over 80 species of butterflies and most of their caterpillars found in the Rocky Mountains, including all of the national parks: Glacier, Yellowstone, Grand Teton, Rocky Mountain, Mesa Verde, Canyonlands, Zion, and Grand Canyon. This pocket-sized guide features color photos in a side-by-side format that makes it idea for field use. The guide includes, along with many of the more common species, several of the region’s most unique species: Rocky Mountain Parnassian; Pale Swallowtail; Large Marble; Pine White; Tailed, Edith’s, Blue, and Lilac-bordered coppers; Western Pine Elfin; Arrowhead, Greenish, and Arctic blues; Milbert’s Tortoiseshell; Gillett’s, Arachne, and Sagebrush checkerspots; Great Spangled, Zerene, and Frigga fritillaries; Hayden’s Ringlet; Small Wood-Nymph; Grizzled and Arctic Skippers; and Western Branded-Skipper. Common and scientific names, adult size, season when they can be found, and their caterpillar host plants are listed. Nature enthusiasts of all ages will enjoy using this marvelous guide.