Vol. 42, No. 1
Western Field Ornithologists
Elevation Ranges of Birds on the Sierra Nevada’s West Slope
Rodney B. Siegel, Robert L. Wilkerson, James F. Saracco, and Zachary L. Steel
An Outpost for Desert Birds on the Coastal Slope of Southern California
Kenneth L. Weaver
First Record of the Bridled Morph of the Common Murre in the Pacific
Annie E. Schmidt and Pete Warzybok
Merlin Chases Passerines Flushed by Northern Harrier
David Vander Pluym and Lori Hargrove
Front cover photo by © Martijn Verdoes/www.agami.nl of Menlo Park, California: Great-winged Petrel (Pterodroma macroptera), Monterey Bay, Santa Cruz County, California, 18 September 2010, representing the third North American record of this Southern Hemisphere species.
Back cover “Featured Photos” by © Dwight Porter of Portland, Oregon: apparent hybrid Townsend’s × Audubon’s Yellow-rumped Warbler (Dendroica townsendi × D. coronata auduboni), Malheur National Wildlife Refuge, Harney County, Oregon, 6 June 2010.