Contents
Thick-billed Parrot Releases in Arizona
Noel F. Snyder, Susan E. Koenig, James Koschmann, Helen A. Snyder, and Terry B. Johnson
Nutrition of Breeding Female Ruddy Ducks: the Role of Nutrient Reserves
Ray T. Alisauskas and C. Davison Ankney
Effects of Hatch Date and Food Supply on Gosling Growth in Arctic-nesting Greater Snow Geese
Anna Lindholm, Gilles Gauthier, and Andre Desrochers
Variation in Body Mass of Wild Canvasback and Redhead Ducklings
Jane E. Austin and Jerome R. Serie
Brown-headed Cowbirds and an Island Population of Song Sparrows: a 16-year Study
James N. Smith and Peter Arcese
Population Parameters of Thick-billed Murres at Coats Island, Northwest Territories, Canada
Anthony J. Gaston, Leah N. Forest, Garry Donaldson, and David G. Noble
Residency Patterns of Migrating Sandpipers at a Midcontinental Stopover
Susan K. Skagen and Fritz L. Knopf
Age Determination of Breeding Shorebirds: Quantification of Feather Wear in the Lekking Great Snipe
Stein Are Saether, John Atle Kalas, and Peder Fiske
Behavioral Patterns and Nearest Neighbor Distances among Nonbreeding American Avocets
Ruth Boettcher, Susan M. Haig, and William C. Bridges Jr.
Great Frigatebird Kleptoparasitism: Sex-specific Host Choice and Age-related Proficiency
James D. Gilardi
Breeding Performance in Relation to Nest-site Substratum in a Buff-necked Ibis (theristicus Caudatus) Population in Patagonia
Jose A. Donazar, Olga Ceballos, Alejandro Travaini, Alejandro Rodriguez, Martin Funes, and Fernando Hiraldo
Autumnal Migration Departure Schedules in Mountain White-crowned Sparrows
Martin L. Morton and Maria E. Pereyra
Geographic Variation in Yellow-headed Blackbirds from the Northern Great Plains
Daniel J. Twedt, William J. Bleier, and George M. Linz
The Use of Cytochrome B Sequence Variation in Estimation of Phylogeny in the Vireonidae
Brent W. Murray, W. Bruce Mcgillivray, Jon C. Barlow, Robin N. Beech, and Curtis Strobeck
Mate Guarding and Extra-pair Paternity in Northern Cardinals
Gary Ritchison, Paul H. Klatt, and David F. Westneat
The Effect of Food Availability on Time and Energy Expenditures of Territorial and Non-territorial Hummingbirds
Donald R. Powers and Todd Mckee
Causes of Nest Desertion during Incubation in the Magellanic Penguin (spheniscus Magellanicus)
Pablo Yorio and P. Dee Boersma
Book Reviews
The Condor
New Books in Ornithology
Christopher W. Thompson
News and Notes
The Condor
Reviewers for Volume 96
The Condor
Index to Volume 96
The Condor
Covers
Back Matter (PDF)
The Condor
Front Matter (PDF)
The Condor
Commentary
On Testing the Hamilton-orians Hypothesis for the Origin of Brood Parasitism
Stephen M. Yezerinac and Kevin W. Dufour
Brood Parasitism and the Hamilton-orians Hypothesis Revisited
Stephen I. Rothstein
Short Communications
Dialect Differences in the Song of Zonotrichia Capensis in the Southern Pampas: a Test of the Acoustic Adaptation Hypothesis
Pablo L. Tubaro and Enrique T. Segura
Aerial Display Sounds of the Black-chinned Hummingbird
Carolyn Pytte and Millicent Sigler Ficken
The Nonbreeding Distribution of the Black Swift: a Clue from Colombia and Unsolved Problems
F. Gary Stiles and Alvaro J. Negret
Nesting Ecology and Helping Behavior in the Azure-rumped Tanager in Mexico
Adrian J. Long and Melanie F. Heath
Reproductive Anatomy of the Chaffinch in Relation to Sperm Competition
B. C. Sheldon and T. R. Birkhead
Climbing Adaptations in the Hindlimb Musculature of the Woodcreepers (dendrocolaptinae)
Robert J. Raikow
The Spur-winged Plover (vanellus Spinosus) is a Determinate Egg Layer
Akiva Yogev and Yoram Yom-Tov
Multiple Cases of Polygyny in the Black-capped Chickadee: a Possible Advantage to the Primary Female
Janine R. Clemmons
Editorial
The Use of Wild Birds in Research
Glenn E. Walsberg