Contents
Daily Energy Expenditure of Savannah Sparrows: Comparison of Time-energy Budget and Doubly-labeled Water Estimates
Joseph B. Williams and Kenneth A. Nagy
The Relationships of the Starlings (sturnidae: Sturnini) and the Mockingbirds (sturnidae: Mimini)
Charles G. Sibley and Jon E. Ahlquist
Tests of Habituation to Song Repertoires by Carolina Wrens
Barbara S. Simpson
100 Years Ago in the Auk
The Auk
Occurrence and Timing of Second Clutches in Common Terns
David A. Wiggins, Ralph D. Morris, I. C. T. Nisbet, and Thomas W. Custer
Notes and News
The Auk
Flight Energetics of Free-living Sooty Terns
Elizabeth N. Flint and Kenneth A. Nagy
Dietary Selectivity in Relation to Availability and Quality of Food for Goslings of Cackling Geese
James S. Sedinger and Dennis G. Raveling
Reliability of Singing Bird Surveys: Changes in Observer Efficiency with Avian Density
Jonathan Bart and James D. Schoultz
Components of Variance in Measurements of Nestling European Starlings (sturnus Vulgaris) in Southeastern Pennsylvania
Robert E. Ricklefs
Growth Energetics of Nestling Northern Gannets (sula Bassanus)
W. A. Montevecchi, R. E. Ricklefs, I. R. Kirkham, and D. Gabaldon
Flight Speed and Directional Responses to Wind by Migrating Canada Geese
Michael L. Wege and Dennis G. Raveling
A Complex Call of the Black-capped Chickadee (parus Atricapillus) I Microgeographic Variation
Millicent S. Ficken and Charles M. Weise
Nutrient Reserve Dynamics of Breeding and Molting Brant
C. Davison Ankney
Spread-wing Postures and the Water Repellency of Feathers: a Test of Rijke's Hypothesis
A. M. Elowson
Covers
Front Matter
The Auk
Back Matter
The Auk
Short Communications
Diurnal Timing of Bird Surveys
Jonathan Bart and Jeffrey Herrick
Vulnerability of Eggs and Young of the Blackish Nightjar (caprimulgus Nigrescens) in Suriname
Johan Ingels, Jan-Hein Ribot, and Ben H. J. De Jong
Embryonic Growth of American Kestrels
David M. Bird, Jean Gautier, and Vern Montpetit
Cayenne Tern New to North America, with Comments on Its Relationship to Sandwich Tern
P. A. Buckley and Francine Geber Buckley
Observer Visitation Frequency and Success of Mourning Dove Nests: a Field Experiment
James D. Nichols, H. Franklin Percival, Richard A. Coon, Michael J. Conroy, Gary L. Hensler, and James E. Hines
Commentaries
Differential Perch-site Selection by Color Morphs of the Red-tailed Hawk (buteo Jamaicensis): a Response to C R Preston
Harald Czikeli
Response to H Czikeli
Charles R. Preston