Contents
The Pallid Falcon Falco Kreyenborgi is a Color Phase of the Austral Peregrine Falcon (falco Peregrinus Cassini)
David H. Ellis and Cesar Peres Garat
Population Studies of the Polyandrous Spotted Sandpiper
Lewis W. Oring, David B. Lank, and Stephen J. Maxson
Fruits and the Ecology of Resplendent Quetzals
Nathaniel T. Wheelwright
Forced Copulation in Captive Mallards Iii Sperm Competition
Kimberly M. Cheng, Jeffrey T. Burns, and Frank Mckinney
Notes and News
The Auk
Temporal Changes in Habitat Selection and Nest Spacing in a Colony of Ross' and Lesser Snow Geese
M. Robert Mclandress
Weights, Breeding, and Survival in European Sparrowhawks
I. Newton, M. Marquiss, and A. Village
Current Status of the Brown-headed Cowbird in the Sierra National Forest
Jared Verner and Lyman V. Ritter
Pacific Coast Caspian Terns: Dynamics of an Expanding Population
Robert E. Gill Jr. and L. Richard Mewaldt
Geographic Variation in Habitat Structure of the Black-throated Green Warbler (dendroica Virens)
Scott L. Collins
Size and Locomotion in Teratorns (aves: Teratornithidae)
Kenneth E. Campbell Jr. and Eduardo P. Tonni
Reproductively Dependent Song Cyclicity in Mated Male Mockingbirds (mimus Polyglottos)
Cheryl A. Logan
Communication with Shared Song Themes in Tufted Titmice
Donna J. Schroeder and R. Haven Wiley
Energetics and Growth Patterns of Three Tropical Bird Species
David M. Bryant and Christopher J. Hails
Dialect Discrimination by White-crowned Sparrows: Reactions to near and Distant Dialects
Diana F. Tomback, Daniel B. Thompson, and Myron Charles Baker
Generalization of and Effects of Pre-exposure on Color-avoidance Learning by Red-winged Blackbirds (agelaius Phoeniceus)
J. Russell Mason and Russell F. Reidinger Jr.
Brood Reduction in Black-legged Kittiwakes
Barbara M. Braun and George L. Hunt Jr.
Aspects of Food Finding by Wintering Bald Eagles
Susan K. Knight and Richard L. Knight
Covers
Front Matter
The Auk
Back Matter
The Auk
Short Communications
Mechanics of Steaming in Steamer-ducks
Bradley Livezey and Philip S. Humphrey
Records of Migrant Hawks from the North Atlantic Ocean
Paul Kerlinger, Jeffrey D. Cherry, and Kevin D. Powers
Co-occurring Groups of Wintering Birds in the Lowlands of Southern California
Richard A. Bradley and David W. Bradley
Homogeneity of Vegetational Cover around the Nest and Avoidance of Nest Predation in Mockingbirds
William T. Joern and James F. Jackson
Breeding Flight Display in the Female White-rumped Sandpiper (calidris Fuscicollis)
Brian J. Mccaffery
Myology and Histology of the Phalloid Organ of the Buffalo Weaver (bubalornis Albirostris)
Gregory Dean Bentz
A New Subspecies of Henslow's Sparrow (ammodramus Henslowii)
Keith A. Arnold
A Ground Nesting Wood Duck
Phillip J. Mason and Julian L. Dusi