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Contents

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Importance of Landfills to Nesting Herring Gulls
Jerrold L. Belant, Thomas W. Seamans, Steven W. Gabrey, and Sheri K. Ickes

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Incubation Rhythms and Mass Loss of Common Goldeneyes
Mark L. Mallory and Patrick J. Weatherhead

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Adoption of Young and Intraspecific Nest Parasitism in Barnacle Geese
Sharmila Choudhury, Catherine S. Jones, Jeffrey M. Black, and Jouke Prop

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Egg-laying Time and Laying Interval in the Common Eider
Michelle D. Watson, Gregory J. Robertson, and Fred Cooke

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Habitat and Food Selection by Emperor Goose Goslings
Karen K. Laing and Dennis G. Raveling

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Estimation of Lipids and Lean Mass of Migrating Sandpipers
Susan K. Skagen, Fritz L. Knopf, and Brian S. Cade

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Frugivory and Coexistence in a Resident and a Migratory Vireo on the Yucatan Peninsula
Russell Greenberg, Daniel K. Niven, Steven Hopp, and Carol Boone

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Book Reviews
Christopher W. Thompson

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News and Notes
The Condor

Covers

Commentary

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Similarity Breeds Confusion: a Reply to Martin
Christopher T. Naughler and Peter C. Smith

Short Communications

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Daily Energy Expenditure by Nestling House Wrens
Cheryl R. Dykstra and William H. Karasov

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Nesting-area Fidelity of Sage Grouse in Southeastern Idaho
Richard A. Fischer, Anthony D. Apa, Wayne L. Wakkinen, Kerry P. Reese, and John W. Connelly

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Renesting by Sage Grouse in Southeastern Idaho
John W. Connelly, Richard A. Fischer, Anthony D. Apa, Kerry P. Reese, and Wayne L. Wakkinen

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The Karyotype of the White-winged Dove
Michael F. Small, Kelly M. Hogan, and James F. Scudday

Historical Perspectives