Contents
Breeding of the Mottled Petrel
John Warham, Bruce R. Keeley, and Graham J. Wilson
The Effects of Dieldrin on the Behavior Young Loggerhead Shrikes
Everette L. Busbee
Hexagonal Packing of Royal Tern Nests
P. A. Buckley and F. G. Buckley
Chlorospingus Flavovirens Rediscovered, with Notes on Other Pacific Colombian and Cauca Valley Birds
Steven L. Hilty
Weaverbird Nest Aggregation and Evolution of the Compound Nest
Nicholas E. Collias and Elsie C. Collias
Swainson's Hawks on the Laramie Plains, Wyoming
Sidney W. Dunkle
Oxygen Consumption, Evaporative Water Loss, and Body Temperature in the Sooty Tern
Richard E. Macmillen, G. Causey Whittow, Ernest A. Christopher, and Roy J. Ebisu
Reproductive Biology of American Robins in Northern Maine
David M. Knupp, Ray B. Owen Jr., and John B. Dimond
Components of Avian Breeding Productivity
Robert E. Ricklefs and George Bloom
Population Energetics of the American White Ibis
James A. Kushlan
Special Review
The Auk
Notes and News
The Auk
General Notes
Bald Eagle Interferes with an Active Osprey Nest
Thomas C. Grubb Jr. and William M. Shields
The Display Flight of the North American Ruddy Duck
Michael R. Miller, Robert M. Mclandress, and Betty Jean Gray
First Ovenbird Specimens from Arizona
R. R. Johnson, L. T. Haight, E. L. Smith, and D. S. Tomko
Cooper's Hawk Hunting in the City
Richard J. Clark
Sun Compass Utilization by Pigeons Wearing Frosted Contact Lenses
K. Schmidt-Koenig and W. T. Keeton
Ejection of Pellets by Captive Ovenbirds
Reto Zach and J. Bruce Falls
Weather-dependent Foraging in Ospreys
Thomas G. Grubb Jr.
Impoundment of the Tombigbee River and Bird Distribution
David T. Rogers Jr.
A Caribbean Barn Swallow Recovery
R. P. Yunick
Audiospectrograms with Pitch Scale: a Universal Language" for Representing Bird Songs Graphically"
Joe T. Marshall Jr.
The Role of the Sternotrachealis Muscles in Bird Song Production
Douglas G. Smith
Responses of Black-capped Chickadee Flocks to Predators
Millicent S. Ficken and Steve R. Witkin
Predation on Rufous Hummingbird by Wied's Crested Flycatcher
George J. Gamboa
Albino Mourning Dove Sightings in Ontario
Edward R. Armstorng and David L. Noakes
A Ground-nesting Wood Duck
Stephen J. Zipko and John Kennington
Rio Grande Turkey Hens with Leg Spurs
Oliver H. Pattee and Samuel L. Beasom
An Unusual Rock Dove Nest
Robert L. Paterson Jr.
Red-cockaded Woodpeckers and Pine Red Heart Disease
Jeroma A. Jackson
Unusual Food Item of Franklin's Gull
David A. Easterla and Doyle L. Damman
The Greater Shearwater in the Northern Gulf of Mexico
Thomas A. Imhof
Differential Growth of Body Parts in the White Ibis
James A. Kushlan
Variation in Size and Quality of the Starling Egg
Robert E. Ricklefs
Second Record of the Mississippi Kite in Guatemala
James W. Parker
Some Blood Characteristics of White-crowned Sparrows during Molt
John D. Chilgren and William A. Degraw
Great Egret Preys on Sandpiper
Robert Repenning
First Pennsylvania Photographic Record and Other Eastern Sightings of the Lazuli Bunting
Robert E. Cook
Courtship Display and Interspecific Isolation Between Laysan and Black-footed Albatrosses
Eugene A. Lefebvre
Covers
Front Matter
The Auk
Back Matter
The Auk