eWestern Birds

The Quarterly Journal of Western Field Ornithologists

Vol. 51, No. 1
March 2020
Western Field Ornithologists

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Contents
MAIN ARTICLES

The 43rd Annual Report of the California Bird Records Committee:
2017 Records

Daniel S. Singer, Thomas A. Benson, Guy McCaskie, and Justyn Stahl

Nevada Bird Records Committee Report for 2018
Jeanne Tinsman and Martin Meyers

Population Assessment of Belding’s Yellowthroat (Geothlypis beldingi)
at San Ignacio Oasis, Baja California Sur, Mexico

Roberto Carmona, Gerardo Marrón, Sergio Águila, Abigail Rivas,
Sergio Flores Ramírez, and Héctor Reyes Bonilla

Earlier Spring Arrival of the Mountain Bluebird in Central Alberta, Canada
Myrna Pearman, Leo de Groot, Geoffrey L. Holroyd,
and Stephanie Thunberg

NOTES

Overlap of Molt and Fall Migration of the Western Tanager
and Warbling Vireo in Southern California
Philip Unitt, Lori Hargrove, and Kevin B. Clark

Northern Pygmy-Owl Predation on an Adult California Quail
Mitchel D. Bosma, Hayley H. Ross, and Robert B. Douglas

A Review of Western Bird Records Committee Websites
Desmond E. Sieburth

Featured Photo: The 2018 Flight of the Buff-Breasted Sandpiper
Steve Hampton

Thank You to Our Supporters

Front cover photo by © Thomas A. Benson of San Bernardino, California: Nazca Boobies (Sula granti), San Diego Bay, San Diego County, California, 16 December 2017. Though the Nazca Booby was first confirmed in California only in 2013, by fall 2019 the number recorded in that state exceeded 50, and the species had been recorded as far north as south-central Alaska.

Back cover “Featured Photo” by © John Sterling of Woodland, California: Buff-breasted Sandpiper (Calidris subruficollis), Morro Strand State Beach, San Luis Obispo County, California, 6 September 2018. The number of Buff-breasted Sandpipers recorded during fall migration each year from British Columbia south through the Pacific states varies widely but is typically under 20. In occasional flight years, such as 2007 and 2018, however, the numbers are much larger: at least 80 in 2007 and 70 in 2018.