This authoritative, easy-to-use photographic reference to 300 species of invertebrate pollinators in the American West will introduce readers to the creatures that feed our flowers, protect our ecosystems, and power our agriculture. This guide covers the Western United states (Colorado, Utah, Wyoming, Idaho, Montana, Nevada, New Mexico, Arizona, Washington, Oregon and California), delineated by plant communities by elevational zones: steppe, foothills, montane, subalpine, and alpine. The focus of this book will be the identification of invertebrate pollinators that the public are likely to encounter in these habitats, organized by order, family, and scientific name.