Contents
Morphological Differentiation of Brown-headed Cowbirds in the Okanagan Valley British Columbia
David Ward and James N. Smith
Factors Affecting Primary Molt in the Gray-headed Albatross
N. D. Cobley and P. A. Prince
Refined Colorimetry Validates Endangered Subspecies of the Least Tern
Ned K. Johnson, J. V. Remsen Jr., and Carla Cicero
Buteo Polyosoma and B. Peocilochrous, the Red-backed Buzzards" of South America, Are Conspecific"
C. Craig Farquhar
Winter Participation by Neotropical Migrant and Resident Birds in Mixed-species Flocks in Northeastern Mexico
Wendy K. Gram
Acoustic Frequencies and Body Mass in New World Doves
Pablo Luis Tubaro and Bettina Mahler
The Influence of Female Age, Body Mass, and Ambient Conditions on Redhead Incubation Constancy
Tina Yerkes
Wood Thrush Postfledging Movements and Habitat Use in Northern Virginia
J. H. Rivera, J. H. Rappole, W. J. Mcshea, and C. A. Haas
Habitat Selection by Northern Spotted Owls: the Consequences of Prey Selection and Distribution
James P. Ward Jr., R. J. Gutierrez, and Barry R. Noon
Song Sparrows Vs. Cowbird Brood Parasites: Impacts of Forest Structure and Nest-site Selection
Brenda Larison, Stephen A. Laymon, Pamela L. Williams, and Thomas B. Smith
Short Incubation Periods of Brown-headed Cowbirds: How Do Cowbird Eggs Hatch Before Yellow Warbler Eggs?
D. Glen Mcmaster and Spencer G. Sealy
The Diet of the Antarctic Shag during Summer at Nelson Island, Antarctica
Marco Favero, Ricardo Casaux, Patricia Silva, Esteban Barrera-Oro, and Nestor Coria
Geographic, Temporal, and Age-specific Variation in Diets of Glaucous Gulls in Western Alaska
Joel A. Schmutz and Keith A. Hobson
Differences in Diet and Chick Provisioning Between Adult Roseate and Sandwich Terns in Puerto Rico
David A. Shealer
Book Reviews
The Condor
Briefly Noted
The Condor
News and Notes
The Condor
Information for Contributors
The Condor
Cover
Front Matter (PDF)
The Condor
Commentary
Species and Subspecies Limits in Least Terns
Barbara W. Massey
Short Communications
Song Sparrow Males Use Female-typical Vocalizations in Fall
Michelle M. Elekonich
Singing Behavior of Lekking Green Hermits
Elizabeth Macdougall-Shackleton and Heidi Harbison
First Breeding Records of Whooper Swan and Brambling in North America at Attu Island, Alaska
Paul W. Sykes and David W. Sonneborn
Factors Affecting Duration of Incubation in Black Brant
Michael W. Eichholz and James S. Sedinger
Nocturnal Variation in Body Temperature of Griffon Vultures
Ofer Bahat, Itzhak Choshniak, and David C. Houston
Effect of Implanted Satellite Transmitters on the Nesting Behavior of Murres
Paul M. Meyers, Scott A. Hatch, and Daniel M. Mulcahy
Interactions Between Black-billed Magpie and Fallow Deer
Peter V. Genov, Paola Gigantesco, and Giovanna Massei