Contents
Costs of Sexual Advertising in the Lekking Jackson's Widowbird
Staffan Anderson
Costs and Rates of Egg Formation in Ruddy Ducks
Ray T. Alisauskas and C. Davison Ankney
Nest Site Selection by Eared Grebes in Minnesota
Janet S. Boe
Molt Migration of Postbreeding Female Mallards from Suisun Marsh, California
Gregory S. Yarris, M. Robert Mclandress, and Alison E.H. Perkins
Age, Habitat and Tide Effects on Feeding Activity of Emperor Geese during Autumn Migration
Joel A. Schmutz
Partial Loss of Red-tailed Hawk Territories to Swainson's Hawks: Relations to Habitat
Stewart W. Janes
Population Variabilities of Bird Guilds in Kansas during Fall and Winter: Weekly Censuses Versus Christmas Bird Counts
Martin A. Stapanian, Christopher C. Smith, and Elmer J. Finck
The Chick-a-dee Call System of the Mexican Chickadee
Millicent Sigler Ficken, Elizabeth D. Hailman, and Jack P. Hailman
Austral Bird Migrants in Paraguay
Floyd E. Hayes, Paul A. Scharf, and Roberts S. Ridgely
Effect and Efficiency of Tartar Emetic in Determining the Diet of Tropical Land Birds
Brigitte Poulin, Gaetan Lefebvre, and Raymond Mcneil
The Composition and Social Organization of Mixed-species Flocks in a Tropical Deciduous Forest in Western Mexico
Richard L. Hutto
Syringeal Morphology and the Phylogeny of the Falconidae
Carole S. Griffiths
Field Metabolic Rate and Food Consumption of Two Sympatric Hummingbird Species in Southeastern Arizona
Donald R. Powers and Timothy M. Conley
Timing of Breeding and Molting in Six Species of Hawaiian Honeycreepers
C. John Ralph and Steven G. Fancy
Sunrise Nest Attentiveness in Cowbird Hosts
Diane L. Neudorf and Spencer G. Sealy
Clutch Size in Passerines of Southern South America
Yoram Yom-Tov, Miguel I. Christie, and Gustavo J. Iglesias
Status and Habitat Use by American Avocets Wintering at Humboldt Bay, California
Thomas J. Evans and Stanley W. Harris
Song Sharing and Repertoires among Migratory and Resident Rufous-sided Towhees
David N. Ewert and Donald E. Kroodsma
Book Reviews
Christopher W. Thompson
New Books in Ornithology
Christopher W. Thompson
News and Notes
The Condor
Information for Contributors
The Condor
Historical Patterns in the Study of Avian Social Behavior
Jerram L. Brown
Covers
Back Matter (PDF)
The Condor
Front Matter (PDF)
The Condor
Short Communications
Diurnal Behavior of the Spotted Owl in Washington
Stan G. Sovern, Eric D. Forsman, Brian L. Biswell, David N. Rolph, and Margaret Taylor
Size of the Bursa of Fabricius in Relation to Gonad Size and Age in Laysan and Black-footed Albatrosses
Jack M. Broughton
Brown Fat in Birds? a Test for the Mammalian Bat-specific Mitochondrial Uncoupling Protein in Common Poorwills
R. Mark Brigham and Paul Trayhurn
Ptilochronology: Follicle History Fails to Influence Growth of an Induced Feather
Thomas C. Grubb and Vladimir V. Pravosudov
Extra-pair Paternity in the Black-capped Chickadee
Ken Otter, Laurene Ratcliffe, and Peter T. Boag
Voice, Plumage and Natural History of Anthony's Nightjar (caprimulgus Anthony)
Mark B. Robbins, Robert S. Ridgely, and Steven W. Cardiff
Effects of Habitat Structure on Patch Use by Loggerhead Shrikes Wintering in a Natural Grassland
Felipe Chavez-Ramirez, Dale E. Gawlik, Felipe G. Prieto, and R. Douglas Slack