Contents
Mimicry of Friarbirds by Orioles
Jared M. Diamond
Feeding Habits and Bill Polymorphism in Hook-billed Kites
Thomas Bates Smith and Stanley A. Temple
Song Pattern Variation in the Sage Sparrow (amphispiza Belli): Dialects or Epiphenomena?
John A. Wiens
A New Species of Palm Swift (tachornis: Apodidae) from the Pleistocene of Puerto Rico
Storrs L. Olson
Regulation of Water Loss from Bonin Petrel (pterodroma Hypoleuca) Eggs
Gilbert S. Grant, Ted N. Pettit, Hermann Rahn, G. Causey Whittow, and Charles V. Paganelli
Notes and News
The Auk
The Role of Migration and Winter Mortality in the Life History of a Temperate-zone Migrant, the Dark-eyed Junco, as Determined from Demographic Analyses of Winter Populations
Ellen D. Ketterson and Val Nolan Jr.
Community Organization of Riparian Breeding Birds: Response to an Annual Resource Peak
Kenneth V. Rosenberg, Robert D. Ohmart, and Bertin W. Anderson
Nesting Ecology of Roseate Spoonbills at Nueces Bay, Texas
Donald H. White, Christine A. Mitchell, and Eugene Cromartie
Hybridization and Breeding Success of Collared and Pied Flycatchers on the Island of Gotland
Rauno V. Alatalo, Lars Gustafsson, and Arne Lundberg
Nesting Success of Dickcissels (spiza Americana) in Preferred and Less Preferred Habitats
John L. Zimmerman
A Study of Fasting in Tree Sparrows (spizella Arborea) and Dark-eyed Juncos (junco Hyemalis): Ecological Implications
Miki M. Stuebe and Ellen D. Ketterson
Notes on the Myology of the Pelvic Limb in Kiwi (apteryx) and in Other Birds
James C. Vanden Berge
Movements and Activities of Radio-tracked Brown-headed Cowbirds
Alfred M. Dufty Jr.
Effect of Habitat Decimation on Ring-billed Gull Colony - and Nest-site Tenacity
Linda K. Southern and William E. Southern
Parental Feeding of Nestling Yellow Warblers in Relation to Brood Size and Prey Availability
Gloria C. Biermann and Spencer G. Sealy
Seasonal Variation and Function of Mobbing and Related Antipredator Behaviors of the American Robin (turdus Migratorius)
Douglas H. Shedd
Egg Predation by Northwestern Crows: Its Association with Human and Bald Eagle Activity
Nicolaas A. M. Verbeek
Territory Size in Megaceryle Alcyon along a Stream Habitat
William James Davis
Book Reviews
The Auk
Covers
Front Matter
The Auk
Back Matter
The Auk
Short Communications
Eggshell Strength and Cowbird Parasitism of Red-winged Blackbirds
Gilbert W. Blankespoor, John Oolman, and Craig Uthe
Evidence of a Boreal Avifauna in Middle Tennessee during the Late Pleistocene
Paul W. Parmalee and Walter E. Klippel
Flightlessness in Flying Steamer-ducks
Philip S. Humphrey and Bradley C. Livezey
Observations on Migratory Turkey Vultures and Lesser Yellow-headed Vultures in Northern Colombia
Friedemann Koester
The Northern Limit of the Hummingbird Genus Oreotrochilus in South America
Fernando I. Ortiz-Crespo and Robert Bleiweiss
Prey Handling in Yellow-crowned Night Herons
Mark F. Riegner
Mortality of Duckling Attributed to Separation from Mother and Subsequent Protracted Exposure to Low Ambient Temperature
Norman R. Seymour
Distribution of the Quetzal in Honduras
Donald A. Hanson
Commentary
Macaroni Penguins: Comment on Mistaken King George Island Breeding Record and Southerly Range Extension
Nicholas J. Volkman, Wayne Z. Trivelpiece, Neil P. Bernstein, and Paul C. Tirrell