Contents
A New Genus and Species of Owl (aves: Strigidae) from Peru
John P. O'Neill and Gary R. Graves
The Skuas of the North American Pacific Coast
Pierre Devillers
In Memoriam: Margaret Morse Nice
Milton B. Trautman
A Test of the Adaptiveness of Interspecific Territoriality in the Blue-throated Hummingbird
David L. Lyon, James Crandall, and Mark Mckone
Colony Selection and Colony Site Tenacity in Ring-billed Gulls at a Stable Colony
William E. Southern
The Grouping of Nocturnal Passerine Migrants
Richard Balcomb
Woodcock Nesting Habitat in Northern Wisconsin
Larry E. Gregg and James B. Hale
Roosting Behavior of the Pi
Russell P. Balda, Michael L. Morrison, and Thomas R. Bement
Demographic Features of a Lapland Longspur Population near Barrow, Alaska
Thomas W. Custer and Frank A. Pitelka
Food Habits and Niche Overlap of Seabirds Wintering on Monterey Bay, California
D. M. Baltz and G. Victor Morejohn
A Quantitative Analysis of the Incubation Behavior of the Ad
Dirk V. Derksen
Two-voice Phenomenon in Birds: Further Evidence
David B. Miller
Avian Play
Millicent S. Ficken
Corrections
Robert J. Raikow
Corrections
The Auk
Notes and News
The Auk
General Notes
Predation in a Salt Marsh Laughing Gull Colony
William A. Montevecchi
Uncommon Natural Injuries in Hawks
David L. Evans
Jackass Penguins Sunning at Sea
J. Cooper
Chemical Residues in Arizona Harris' Hawk Eggs
William J. Mader
An Unusual Interaction Between Blue-winged and Golden-winged Warblers in Virginia
Curtis S. Adkisson and Scott S. Campbell
Adaptive Significance of Cowbird Egg Distribution
Phillip F. Elliott
Cannibalism in Adult Nesting Red-tailed Hawks
James F. Steffen
Defense of Feeding Sites by Orioles and Hepatic Tanagers in Mexico
Robert William Cruden and Sharon Marie Hermann-Parker
Helpers at the Nest in Barn Swallows
Gerald R. Myers and David W. Waller
Leapfrog Feeding in the Great Egret
Douglas Gladstone
The Breeding Status of the Long-billed Curlew in Colorado
D. Archibald Mccallum, Walter D. Graul, and Ronald Zaccagnini
Hoopoe, a First Record for North America
Christian P. Dau and Jack Paniyak
Color Selection of Nesting Material by Killdeer
Robert C. Kull Jr.
Gray-rumped Tattlers Catching Fish
David Melville
The Azure-rumped Tanager in Mexico with Comparative Remarks on the Gray-and-gold Tanager
Steven L. Hilty and David Simon
A Simple Technique for Analyzing Bird Transect Counts
Martha Hatch Balph, L. Charles Stoddart, and David F. Balph
Eleven-day Incubation by an American Robin
Hervey Brackbill
Morphological and Behavioral Development of the Mandarin Duck
Richard L. Bruggers and William B. Jackson
Willow Ptarmigan Remove Broken Eggs from the Nest
H. M. Allen and H. Parker
Altruism in Nesting Yellow-bellied Sapsucker
Lawrence Kilham
Covers
Front Matter
The Auk
Back Matter
The Auk