Contents
Reproductive Biology of Shrubsteppe Passerine Birds: Geographical and Temporal Variation in Clutch Size, Brood Size, and Fledging Success
John T. Rotenberry and John A. Wiens
Nonrandom Mating in Feral Pigeons
Richard F. Johnston and Steven G. Johnson
Similarity in the Development of Foraging Mechanics among Sibling Ospreys
Thomas C. Edwards Jr.
Mate Feeding by Western and Clark's Grebes
Gary L. Nuechterlein and Robert W. Storer
Intrasexual Aggression and the Mating Behavior of Brown-headed Cowbirds: Their Relation to Population Densities and Sex Ratios
David A. Yokel
Dispersal in the Communally Breeding Groove-billed Ani (crotophaga Sulcirostris)
Bonnie S. Bowen, Rolf R. Koford, and Sandra L. Vehrencamp
Food Habits of the Whiskered Auklet at Buldir Island, Alaska
Robert H. Day and G. Vernon Byrd
Effects of Varied Electrophoretic Conditions on Detection of Evolutionary Patterns in the Laridae
Shannon J. Hackett
Nest-site Selection by Yellow-footed Gulls
Larry B. Spear and Daniel W. Anderson
Environmental Factors Influencing Nest-site Preference in White-browed Sparrow-weavers (plocepasser Mahali)
J. W. Ferguson and W. R. Siegfried
Dependency on Testosterone of Photoperiodically-induced Vernal Fat Deposition in Female White-crowned Sparrows
Hubert Schwabl and Donald S. Farner
An Experimental Test of Prey Distribution Learning in Two Paruline Warblers
Christopher J. Whelan
The Importance of Invariant and Distinctive Features in Species Recognition of Bird Song
Douglas A. Nelson
Parental Attendance and Brood Care in Four Argentine Dabbling Ducks
Frank Mckinney and Gwen Brewer
Fall Colony Attendance and Breeding Success in the Common Murre
M. P. Harris and S. Wanless
Fat Cyclicity, Predicted Migratory Flight Ranges, and Features of Wintering Behavior in Pacific Golden-plovers
Oscar W. Johnson, Martin L. Morton, Phillip L. Bruner, and Patricia M. Johnson
Body-mass Variation in Breeding Northern Wheatears: a Field Experiment with Supplementary Food
Juan Moreno
The Silky-tailed Nightjar and Other Neotropical Caprimulgids; Unraveling Some Mysteries
John William Hardy and Roberto Straneck
Book Reviews
March F. Lawton
In Memoriam
Emily Dinnin Smith
News and Notes
The Condor
Information for Contributors
The Condor
Covers
Back Matter (PDF)
The Condor
Front Matter (PDF)
The Condor
Short Communications
Survival and Breeding Philopatry in Barrow's and Common Goldeneyes
Jean-Pierre L. Savard and John Mca. Eadie
Sex and Egg Size in Great-tailed Grackles
Kevin L. Teather
Nestling and Egg Destruction by House Wrens
Michael S. Quinn and Geoffrey L. Holroyd
Adjacency Patterns in the Song-type Deliveries of Western Meadowlarks
Maria Klemperer Aweida
Heritability of Wing Length and Weight in European Bee-eaters(merops Apiaster)
C. M. Lessells and G. N. Ovenden
Two New Records of Birds for Southern Mexico
J. Luis Rangel-Salazar and J. Humberto Vega-Rivera
Mate Fidelity and Breeding-site Specificity of the Turquoise-browed Motmot
Robert F. Martin, Peter E. Scott, and Mark W. Martin
Observations on the Breeding of the Arctic Warbler in Alaska
Trevor Price and Desiree Beck