Contents
Cultural and Genetic Differentiation of Two Subspecies of White-crowned Sparrow
Myron Charles Baker, Michael A. Cunningham, and Andrew D. Thompsen Jr.
Sexual Dimorphism in Continental Steamer-ducks
Bradley C. Livezey and Philip S. Humphrey
A Peregrine Falcon Polymorph: Observations of the Reproductive Behavior of Falco Kreyenborgi
John W. McNutt
Lead Concentrations and Reproduction in Highway-nesting Barn Swallows
Christian E. Grue, Thomas J. O'Shea, and David J. Hoffman
Osmoregulation in Nestling Glaucous-winged Gulls
Maryanne R. Hughes
Recent Publications
The Condor
Proper Expression of Metabolizable Energy in Avian Energetics
Michael R. Miller and Kenneth J. Reinecke
Breeding Season Time Budgets of the Southern Black-backed Gull in Antarctica
Stephen J. Maxson and Neil P. Bernstein
Prey Handling Relationships in Captive Ovenbirds
Cynthia A. Paszkowski and Timothy C. Moermond
Karyotypic Uniformity in the Red-winged Blackbird
James Cox and Frances C. James
Growth and Sexual Dimorphism of the Boat-tailed Grackle
G. Thomas Bancroft
Vocalizations of the Purple Martin
Charles R. Brown
Altitudinal Variations in Nests of the Hawaiian Honey Creeper Hemignathus Virens Virens
Michael D. Kern and Charles Van Riper III
Racial Differences in Nests of White-crowned Sparrows
Michael D. Kern
Frequency, Spatial Distribution and Nest Attendants of Supernormal Clutches in Ring-billed and California Gulls
Michael R. Conover
Experimental Evidence that Female-female Pairs in Gulls Result from a Shortage of Breeding Males
Michael R. Conover and George L. Hunt Jr.
Impact of Winter Stress on Mallard Body Composition
Richard J. Whyte and Eric G. Bolen
News and Notes
The Condor
Treasurer's Report
The Condor
Index to Volume 86
The Condor
Covers
Back Matter (PDF)
The Condor
Front Matter (PDF)
The Condor
Short Communications
Damaged Western Flycatcher Eggs in Nests Containing Brown-headed Cowbird Chicks
Patricia M. Dolan and Philip L. Wright
Observations on Female Promiscuity in the Red-shouldered Hawk
Michael D. McCrary and Peter H. Bloom
A Record of Tree-nesting Prairie Falcons in Wyoming
Patricia A. MacLaren, Douglas E. Runde, and Stanley H. Anderson
Agonistic "whirling" by Zone-tailed Hawks
William S. Clark
Male-dominated Incubation in Ospreys
Karl E. Grover
Mid-winter Lipid Reserves of the Golden-crowned Kinglet
Charles R. Blem and John F. Pagels
White-faced Ibis Nesting in the Southern San Joaquin Valley of California
Gary L. Ivey and Daniel J. Severson
An Archaeological Record for the White-faced Whistling-duck (dendrocygna Viduata) in Central Panama
Richard G. Cooke and Storrs L. Olson
An Alternative Origin of Supernormal Clutches in Caspian Terns
Stephen T. Penland