Contents
Resolution of Cryptic Species in Appalachian Red Crossbills
Jeffrey G. Groth
Genetic Differentiation among Steamer-ducks (anatidae: Tachyeres): an Electrophoretic Analysis
Kendall W. Corbin, Bradley C. Livezey, and Philip S. Humphrey
Seasonal Occurrence of Migrant Whimbrels and Bristle-thighed Curlews on the Yukon-kuskokwim Delta, Alaska
Colleen M. Handel and Christian P. Dau
Determinants of the Vertical Distributions of Woodpecker Nest Cavities in the Sahuaro Cactus
Joseph R. Mcauliffe
Morphometric Variation in Tundra Swans: Relationships among Sex and Age Classes
Sherri L. Miller, Michael A. Gregg, Amy R. Kuritsubo, Shawn M. Combs, Mary K. Murdock, John A. Nilsson, Barry R. Noon, and Richard G. Botzler
The Effect of Radio Transmitters on the Behavior of Common Murres and Razorbills during Chick Rearing
S. Wanless, M. P. Harris, and J. A. Morris
Length of Stay and Fat Content of Migrant Semipalmated Sandpipers in Eastern Maine
Peter O. Dunn, Terry A. May, Mark A. Mccollough, and Marshall A. Howe
Nutrition and Condition of Ruffed Grouse during the Breeding Season in Southwestern Virginia
Frederick A. Servello and Roy L. Kirkpatrick
Nest-site Selection by Roseate Terns in Two Tropical Colonies on Culebra, Puerto Rico
Joanna Burger and Michael Gochfeld
Evidence for Prey Limitation of Common and Roseate Tern Reproduction
Carl Safina, Joanna Burger, Michael Gochfeld, and Richard H. Wagner
Population Ecology of Snowy Owls during Winter on the Great Plains of North America
P. Kerlinger and M. Ross Lein
Ecological Relations of Sympatric Black-capped and Mountain Chickadees in Southwestern Alberta
Brad G. Hill and M. Ross Lein
Phylogeny of the Phalacrocoracidae
Douglas Siegel-Causey
Status of the Endemic Atitlan Grebe of Guatemala: is It Extinct?
Laurie A. Hunter
Temperature Regulation in Turkey Vultures
Zeev Arad and Marvin H. Bernstein
Effects of Brood Parasitism and Nest-box Placement on Wood Duck Breeding Ecology
Brad Semel, Paul W. Sherman, and Steven M. Byers
Book Reviews
Marcy F. Lawton
News and Notes
The Condor
Reviewers for Volume 90
The Condor
Index to Volume 90
The Condor
Covers
Back Matter (PDF)
The Condor
Front Matter (PDF)
The Condor
Short Communications
Female Pairing: a Reproductive Strategy for Herring Gulls
Gary W. Shugart, Mary A. Fitch, and Glen A. Fox
Destruction of Eggs by Western Meadowlarks
Catherine Schaeff and Jaroslav Picman
Hematocrit and Protein Concentration of Black Vulture and Turkey Vulture Blood
John S. Coleman, James D. Fraser, and Patrick F. Scanlon
The Effects of Repeated Blood Sampling on Survival in Brown-headed Cowbirds
Alfred M. Dufty Jr.
Effects of Blood Sampling on Shorebirds: Injuries, Return Rates and Clutch Desertions
Mark A. Colwell, Cheri L. Gratto, Lewis W. Oring, and Albert J. Fivizzani
Adverse Effects of Radio Transmitters on the Behavior of Nesting Least Terns
Barbara W. Massey, Kathleen Keane, and Constance Boardman
First Description of the Nest and Eggs of the Moss-backed Tanager (buthraupis [bangsia] Edwardsi)
Mark B. Robbins and George S. Glenn
Observations on the Nesting of the Great Potoo (nyctibius Grandis) in Central Venezuela
Eric A. Vanderwerf
Why Do Ravens Fear Their Food?
Bernd Heinrich
Ravens Observed Killing Roosting Kittiwakes
David F. Parmelee and Jean M. Parmelee
Evidence that Bank Swallow Colonies Do Not Function as Information Centers
Bridget J. Stutchbury
Cold Tolerance of European Blackbird Embryos and Nestlings
Robert D. Magrath
Foraging Behavior and Foods of the Light-footed Clapper Rail
Richard Zembal and Jack M. Fancher
Eggshell Differences Between Parasitic and Nonparasitic Icteridae
H. Rahn, Linda Curran-Everett, and D. T. Booth
The Composition of Ancient Murrelet Eggs
T. R. Birkhead and A. J. Gaston