Contents
Florida Scrub Jay Helpers at the Nest
Glen E. Woolfenden
The Red-whiskered Bulbul in Florida: 1960-71
Alison Rand Carleton and Oscar T. Owre
Daylength and the Hummingbirds' Use of Time
William A. Calder
Larid Site Tenacity and Group Adherence in Relation to Habitat
Martin K. Mcnicholl
Primary Molt in Circus Cyaneus in Relation to Nest Brood Events
Josef K. Schmutz and Sheila M. Schmutz
Notes on Cattle Egret Breeding
William J. Weber
In Memoriam: Clarence Cottam
Eric G. Bolen
Obituaries
The Auk
Notes and News
The Auk
Letter to the Editor
The Auk
General Notes
A New Species of Anhinga (anhingidae) from the Upper Pliocene of Nebraska
Larry D. Martin and Robert M. Mengel
Least Tern Breeding Range Extension in Maine
Malcolm L. Hunter Jr.
First Massachusetts Specimen of Le Conte's Sparrow
Kathleen S. Anderson
First Northwestern Atlantic Breeding Record of the Manx Shearwater
Richard O. Bierregaard Jr., Augustus Ben David II, Timothy D. Baird, and Robert E. Woodruff
Roadrunner Predation on Ground Squirrels in California
Vernon C. Bleich
Mate Fidelity and Nesting Site Tenacity in the Killdeer
Sarah Lenington and Terry Mace
Copulatory Behavior of a Pair of Yellow-billed Cuckoos
D. Paul Hendricks
Mechanism of Feather Replacement in a Hummingbird
Larry L. Wolf
Redhead Breeding in the State of Jalisco, Mexico
Sartor O. Williams II
Arctic Tern in Arizona
Gale Monson and Stephen M. Russell
Herring and Great Black-backed Gulls Nesting in North Carolina
James F. Parnell and Robert F. Soots
Relationships of Nesting Hawks with Great Horned Owl
James W. Wiley
California Gulls Attack Waterfowl Broods in Alberta
Gerry M. Lynch and John E. Toepfer
First Oregon Specimen of Icterus Galbula Galbula
M. Ralph Browning
Effect of Parentage on Egg Characteristics
S. Charles Kendeigh
Willet Breeding in Los Roques Archipelago, Venezuela
William H. Phelps Jr.
Ash-throated Flycatcher in Illinois: Summary of Records East of the Mississippi River
H. David Bohlen
Invalid Record of a Rail from Mazatl
Richard C. Banks
The Gular Pouch of the Female White Ibis
Thomas Rudegeair
Snipe Breeding Displays Performed on Wintering Grounds
Robert H. Naney
Covers
Front Matter
The Auk
Back Matter
The Auk