Contents
The Energetic Significance of Huddling Behavior in Common Bushtits (psaltriparus Minimus)
Susan B. Chaplin
Structural Changes in Song Ontogeny in the Swamp Sparrow Melospiza Georgiana
Peter Marler and Susan Peters
Notes and News
The Auk
Predation and Coloniality in Cliff Swallows (petrochelidon Pyrrhonota)
Gerald S. Wilkinson and Gregory M. English-Loeb
Factors Determining Seasonal Changes in Attendance at Colonies of the Thick-billed Murre Uria Lomvia
A. J. Gaston and D. N. Nettleship
Syringeal Mechanics Reassessed: Evidence from Streptopelia
Asbot S. Gaunt, Sandra L. Gaunt, and Richard M. Casey
Coat Color, Solar Heat Gain, and Conspicuousness in the Phainopepla
Glenn E. Walsberg
The Structure of Western Warbler Assemblages: Ecomorphological Analysis of the Black-throated Gray and Hermit Warblers
Michael L. Morrison
Karyotypes of Six Species of North American Blackbirds (icteridae: Passeriformes)
Holly H. Hobart, Scott J. Gunn, and John W. Bickham
A Test for Conspecific Egg Discrimination in Three Species of Colonial Passerine Birds
Glen A. Lanier Jr.
Ecological and Social Factors Affecting Hatchability of Eggs
Walter D. Koenig
Song Dialects and Mate Selection in Montane White-crowned Sparrows
Luis F. Baptista and Martin L. Morton
Observational Learning of Food Aversions in Red-winged Blackbirds (agelaius Phoeniceus)
J. Russell Mason and Russell F. Reidinger
Polygyny, Male Parental Care, and Sex Ratio in Song Sparrows: an Experimental Study
James N. Smith, Yoram Yom-Tov, and Richard Moses
In Memoriam: Edgar Gustav Franz Sauer
Oliver L. Austin Jr.
Book Reviews
The Auk
Covers
Front Matter
The Auk
Back Matter
The Auk
Short Communications
Function of the Bill and Tongue in Nectar Uptake by Hummingbirds
Paul W. Ewald and William A. Williams
A Reevaluation of the Pliocene Owl Lechusa Stirtoni Miller
Robert M. Chandler
Evidence for Wintering and Resident Populations of Swainson's Flycatcher (myiarchus Swainsoni) in Northern Suriname
Wesley E. Lanyon
Radio-instrumented Mourning Dove Preyed upon by Gray Rat Snake
R. E. Mirarchi and R. R. Hitchcock
Reproductive Synchrony and Predator Satiation: an Analogy Between the Darling Effect in Birds and Mast Fruiting in Plants
Michael Gochfeld
Absence of Wing-spreading Behavior in the Antarctic Blue-eyed Shag (phalacrocorax Atriceps Bransfieldensis)
Neil P. Bernstein and Stephen J. Maxson
Immanuel Kant and the Song of the House Sparrow
Wolfgang Wickler
Nest-sharing by a Lark Sparrow
Diana K. Crowell, Charles C. Carpenter, and David G. Huffman
Commentaries
Forum: Avian Subspecies in the 1980's
John A. Wiens
Of what Use Are Subspecies?
Ernst Mayr
Subspecific Taxonomy: Unfashionable Does Not Mean Irrelevant
Kenneth C. Parkes
Might There Be a Resurrection of the Subspecies?
Frank B. Gill
Subspecies and the Study of Geographic Variation
Robert W. Storer
Geographic Variation, Predictiveness, and Subspecies
George F. Barrowclough
The Subspecies Concept: Then, Now, and Always
Wesley E. Lanyon
Retain Subspecies--at Least for the Time Being
Ned K. Johnson
A Modern Concept of the Subspecies
Burt L. Monroe Jr.
The Subspecies Concept in the 1980's
John P. O'Neill
Subspecies and Species: Fundamentals, Needs, and Obstacles
Alan R. Phillips