Delight in the Sierra Nevadas diverse avifauna with this longawaited field guide Identify and learn about over two hundred and fifty birds of the Sierra Nevada. From tiniest hummingbirds to condors with ninefoot wingspans from lowerelevation wrens to the rasping nutcrackers of the High Sierra from urban House Sparrows to wild waterloving American Dippers Hansens Field Guide to the Birds of the Sierra Nevada showcases artistnaturalist Keith Hansens sixteenyear project to illustrate the bird