This guide—including the valley, foothills, coastal and metro areas—beautifully illustrates 84 species of butterfly and nearly all of the corresponding caterpillar forms found in Central and Northern California. This pocket-sized guide features color photos in a side-by-side format that makes it ideal for field use. Included along with most of the more common species are several of the most unique species of the region. 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.