Contents
Vigilance Patterns of Bald Eagles Feeding in Groups
Susan K. Knight and Richard L. Knight
Differences in Susceptibility to Predation during Nesting Between Pied and Black Stilts (himantopus Spp)
Raymond J. Pierce
A Previously Unknown Plumage of First-year Indigo Buntings and Theories of Delayed Plumage Maturation
Sievert Rohwer
Notes and News
The Auk
Molt of Female Lesser Scaup Immediately Following Breeding
Jane E. Austin and Leigh H. Fredrickson
Bioenergetics of Egg Production by Female House Sparrows
David G. Krementz and C. Davison Ankney
100 Years Ago in the Auk
The Auk
Reproductive Performance of Seabirds: the Importance of Population and Colony Size
George L. Hunt Jr., Zoe A. Eppley, and David C. Schneider
Why Does Intensity of Avian Nest Defense Increase during the Nesting Cycle?
Richard L. Knight and Stanley A. Temple
Influence of Resource Abundance on Use of Tree-fall Gaps by Birds in an Isolated Woodlot
John G. Blake and William G. Hoppes
Generic Status of Euler's Flycatcher: a Morphological and Biochemical Study
Wesley E. Lanyon and Scott M. Lanyon
Survival Analysis of Eggs and Chicks of Ad
Lloyd S. Davis and Frances T. Mccaffrey
Sources of Variation in Growth of Tree Swallows
Terry E. Quinney, David J. Hussell, and C. Davison Ankney
Proximate and Ultimate Causation of Egg Size and the Third-chick Disadvantage" in the Western Gull"
Raymond Pierotti and Cheryl A. Bellrose
Old Age and Breeding Behavior in a Tropical Passerine Bird Ploceus Cucullatus under Controlled Conditions
N. E. Collias, E. C. Collias, C. H. Jacobs, C. R. Cox, and F. A. Mcalary
In Memoriam: W Rudyerd Boulton
Melvin A. Traylor Jr.
Brewster and Coues Awards
The Auk
Covers
Front Matter
The Auk
Back Matter
The Auk
Short Communications
Sexual Differences in the Spatial Distribution of Foraging in White-throated Sparrows (zonotrichia Albicollis)
Fred E. Wasserman
Parental Behavior of a Bigamous Male Northern Mockingbird
Randall Breitwisch, Ronald C. Ritter, and Julia Zaias
Stomach Pumping: is Killing Seabirds Necessary?
Peter G. Ryan and Susan Jackson
A Safe and Accurate Method for Force-feeding Small Granivorous Birds
Mary E. Murphy and James R. King
Philydor Hylobius Wetmore and Phelps is a Synonym of Automolus Roraimae Hellmayr
Robert W. Dickerman, George F. Barrowclough, Peter F. Cannell, William H. Phelps Jr., and David E. Willard
Frequency of Arthropods in Stomachs of Tropical Hummingbirds
J. V. Remsen Jr., F. Gary Stiles, and Peter E. Scott
Commentary
Polygyny in Tree Swallows: Response to R E Simmons
Terry E. Quinney