Contents
Regional Differences in Habitat Occupancy by Bachman's Sparrow
John B. Dunning Jr. and Bryan D. Watts
Comparison of Phenotypic and Genetic Differentiation in South American Antwrens (formicariidae)
Shannon J. Hackett and Kenneth V. Rosenberg
The Relationship Between Wing Shape and Differential Migration in the Dark-eyed Junco
Robert S. Mulvihill and C. Ray Chandler
Foraging Behavior and Microhabitat Use of Two Species of White-eyes (zosteropidae) on Saipan, Micronesia
Robert J. Craig
Foraging Behavior, Reproductive Success, and Colonial Nesting in Ospreys
John M. Iii and Jeffrey R. Walters
Flock Formation of Two Parids in Relation to Cyclical Seed Production in a Pinyon-juniper Woodland
Kimberly A. With and Michael L. Morrison
Variation in Osmoregulatory Parameters of Captive and Wild House Sparrows (passer Domesticus)
David L. Goldstein and Afshan Zahedi
Sexual Segregation by Habitat in Migratory Warblers in Quintana Roo, Mexico
Arturo Lopez Ornat and Russell Greenberg
Food Avoidance by Red-winged Blackbirds Conditioned with a Pyrazine Odor
Michael L. Avery and Curtis O. Nelms
Agonistic Behavior and Dominance Relationships among Lesser Snow Geese during Winter and Spring Migration
Paul E. Gregoire and C. Davison Ankney
100 Years Ago in the Auk
The Auk
Seasonal Variation in Cold Hardiness and Peak Rates of Cold-induced Thermogenesis in the Dark-eyed Junco (junco Hyemalis)
David L. Swanson
Roosting Behavior of Postfledging Eastern Screech-owls
James R. Belthoff and Gary Ritchison
Effects of Brood Size and Nestling Age on Parental Care by Male Field Sparrows (spizella Pusilla)
Michael Carey
Estimating the Effect of Wind on Avian Metabolic Rate with Standard Operative Temperature
George S. Bakken
Estimating Nest Success: When Mayfield Wins
Douglas H. Johnson and Terry L. Shaffer
In Memoriam: Julian R Ford, 1932-1987
J. Allen Keast
In Memoriam: Margaret Howell Mitchell, 1901-1988
Marianne Gosztonyi Ainley
In Memoriam: Sir Peter Markham Scott, 1909-1989
Gustav A. Swanson
Covers
Front Matter
The Auk
Back Matter
The Auk
Short Communications
Breeding Status and Sex of Common Murres (uria Aalge) at a Colony in Autumn
M. P. Harris and S. Wanless
Hurricane Damage to Red-cockaded Woodpecker (picoides Borealis) Cavity Trees
R. Todd Engstrom and Gregory W. Evans
Geographic Variation in the Juvenal Plumage of the Common Nighthawk (chordeiles Minor) in North America
Robert W. Dickerman
Genetic Variation and Population Structure of the Florida Wood Stork
Peter W. Stangel, James A. Rodgers Jr., and A. Lawrence Bryan
Song Features Birds Use to Identify Individuals
Daniel M. Weary, Ken J. Norris, and J. Bruce Falls
Effects of Unit Size and Territory Defense on Communal Nest Care in the Hoatzin (opisthocomus Hoazin)
Eric A. Vanderwerf and Stuart D. Strahl