Contents
The Effect of Aggregated Nesting on Red-winged Blackbird Nest Success and Brood Parasitism by Brown-headed Cowbirds
Ethan D. Clotfelter and Ken Yasukawa
Costs of Coloniality and the Effect of Colony Size on Reproductive Success in Purple Martins
Jeffrey A. Davis and Charles R. Brown
Replacement Clutches by Kentish Plovers
Juan A. Amat, Rosendo M. Fraga, and Gonzalo M. Arroyo
Variation in the Onset of Incubation in a Neotropical Parrot
J. Letitia Grenier and Steven R. Beissinger
Winter Ecology of the Endangered Golden-cheeked Warbler
John H. Rappole, David I. King, and Wylie C. Barrow Jr.
Habitat Associations of Migrating and Overwintering Grassland Birds in Southern Texas
Lawrence D. Igl and Bart M. Ballard
Interaction Between Magellanic Penguins and Shrimp Fisheries in Patagonia, Argentina
Patricia A. Gandini, Esteban Frere, Alejandro D. Pettovello, and Paula V. Cedrola
Spatial and Temporal Patterns in the Diet of the Kelp Gull in Patagonia
Marcelo Bertellotti and Pablo Yoria
Eurasian Hobby Density, Nest Area Occupancy, Diet and Productivity in Relation to Intensive Agriculture
Fabrizio Sergio and Giuseppe Bogliani
Factors Affecting Prey Preparation by Adult Magpies Feeding Nestlings
Adrian Ponz, Jose A. Gil-Delgado, and Emilio Barba
Using Radio-transmitters to Improve Estimates of Gull Predation on Common Eider Ducklings
K. Mawhinney and A. W. Diamond
The Development of Endothermy in American White Pelicans
Christine L. Abraham and Roger M. Evans
Book Reviews
The Condor
News and Notes
The Condor
Award Announcements
The Condor
Reviewers for Volume 101
The Condor
Index for Volume 101
The Condor
Covers
Back Matter (PDF)
The Condor
Front Matter (PDF)
The Condor
Commentary
Nest Placement and Mortality: is Nest Predation a Random Event in Space and Time?
Kenneth A. Schmidt and Christopher J. Whelan
Does Nonrandom Nest Placement Imply Nonrandom Nest Predation?-a Reply
Robert J. Cooper, R. Randy Wilson, Gary D. Zenitsky, Stephen J. Mullin, Jennifer A. Dececco, Matthew R. Marshall, Dorothy J. Wolf, and Lars Y. Pomara
Short Communications
Tan and White Color Morphs of White-throated Sparrows Differ in Their Non-song Vocal Responses to Territorial Intrusion
Christine E. Collins and Anne M. Houtman
Microgeographic Song Discrimination in a Nonterritorial Passerine, the Boat-tailed Grackle
David S. Melman and William A. Searcy
Sperm Competition and Sperm Length in Shorebirds
Dominic D. Johnson and James V. Briskie
Genetic Monogamy in Long-eared Owls
Jeffrey S. Marks, Janis L. Dickinson, and Joseph Haydock
Brown Thrasher Nest Reuse: a Time Saving Resource, Protection from Search-strategy Predators, or Cues for Nest-site Selection?
John F. Cavitt, Aaron T. Pears, and Todd A. Miller
The Thermal and Energetic Significance of Cavity Roosting in Mountain Chickadees and Juniper Titmice
Sheldon J. Cooper
Predation on Rhinoceros Auklet Eggs by a Native Population of Peromyscus
Louise K. Blight, John L. Ryder, and Douglas F. Bertram
The Proximate Effects of Rainfall on Clutch Size of the California Gnatcatcher
Michael A. Pattne and John T. Rotenberry
Social Dominance and Energy Reserves in Wintering Woodland Birds
Vladimir V. Pravosudov, Thomas C. Grubb Jr., Paul F. Doherty Jr., C. L. Bronson, Elena V. Pravosudova, and Andrew S. Dolby
Plastic Color Bands Have No Detectable Short-term Effects on White-breasted Nuthatch Behavior
Valerie A. Weiss and Daniel A. Cristol
Molecular Vs. Phenotypic Sexing in Red Knots
Allan J. Baker, Theunis Piersma, and Annette D. Greenslade
Molt Chronology of American Coots in Winter
S. Keith Mcknight and Gary Hepp
Trophic Relationships among Six Species of Icelandic Seabirds as Determined through Stable Isotope Analysis
David R. Thompson, Kristian Lilliendahl, Jon Solmundsson, Robert W. Furness, Susan Waldron, and Richard A. Phillips
Digestive Enzymes of a Small Avian Herbivore, the Rufous-tailed Plantcutter
Christine Meynard, M. Victoria Lopez-Calleja, Francisco Bozinovic, and Pablo Sabat
Breeding of the Gray-winged Trumpeter in French Guiana
Pierre De Mercey and Marc Thery