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The Quarterly Journal of Western Field Ornithologists

Vol. 52, No. 4
November 2021
Western Field Ornithologists

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Contents
MAIN ARTICLES

Fall Waterfowl Use of Bridgeport Reservoir, Mono County, California
Deborah J. House

Age and Sex Influence Natal and Breeding Dispersal of Purple Martins
Carolyn A. Cook, Glen T. Hvenegaard,
Geoffrey L. Holroyd, Hardy Pletz, and Myrna Pearman

Using Song Dialects to Assess the Migration Strategy of the Golden-crowned Sparrow
Edward R. Pandolfino and Lily A. Douglas

A Novel Locality for the Observation of Thousands of Passerine Birds during Spring Migration in Los Angeles County, California
Ryan S. Terrill, Christine A. Dean, John Garrett, Daniel J. Maxwell, Lauren Hill, Andrew Farnsworth, Adriaan Dokter, and Morgan W. Tingley

NOTES

Burrowing Owls Produce Second Brood in Mountain View, California
Philip G. Higgins, Debra Chromczak, and Ryan A. Phillips

Characteristics of Nests of Belding’s Savannah Sparrow at Estero Punta Banda, Mexico
Hiram Rafael Moreno-Higareda,
Gorgonio Ruiz-Campos, Manuel Alejandro Carballo Amador,
and Horacio de la Cueva

First Record of the Long-tailed Duck for Coahuila, Mexico
Hugo González-Páez, Armando J. Contreras-Balderas, Gorgonio Ruiz-Campos, and Juan A. García-Salas

First Documented Breeding of the Black-headed Grosbeak in Alaska
Zachary M. Pohlen, Callie F. Gesmundo, and Nicholas R. Hajdukovich

Book Review: Birdpedia
Edward R. Pandolfino

Thanks to Western Birds’ Reviewers and Associate Editors

Index
Daniel D. Gibson

Front cover photo by © Deborah J. House of Bishop, California: Bridgeport Reservoir, Mono County, California, 17 October 2018. Seventeen years of systematic surveys demonstrate the importance of Bridgeport Reservoir as a fall stopover for migrating waterfowl, especially dabbling ducks. Yet the trend in their numbers over this period has been a decline, paralleling the intensification of drought threatening the scattered wetlands of the Great Basin.

Back cover photos by © Ryan S. Terrill of Los Angeles, California: Western Tanager (Piranga ludoviciana) and Yellow-rumped Warbler (Setophaga coronata) as they pass in migration over Bear Divide, San Gabriel Mountains, Los Angeles County, California, on 5 May and 4 April 2021, respectively. Bear Divide is newly revealed as a point of concentration and unparalleled visibility of land birds as they head north in spring migration along the Pacific Flyway.