- Covers 1,900 of the most common species in western North America
- Features more than 2,000 spectacular color photos of live specimens, at rest, including examples of variations and sexual dimorphism where present
- Species accounts describe key identification features and include information on caterpillar host plants, the time of year in which adults may be found, and the probability of encountering each species
- Includes a range map for each species
- Provides invaluable tips for newcomers on how to get started observing moths
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