Contents
Plot Mapping: Estimating Densities of Breeding Bird Territories by Combining Spot Mapping and Transect Techniques
Steven P. Christman
Recent Publications
The Condor
The Breeding Biology of Captive Black-headed Ducks and the Behavior of Their Young
Eileen C. Rees and Nigella Hillgarth
Dominance in Wintering Waterfowl (anatini): Effects on Distribution of Sexes
Gary R. Hepp and Jay D. Hair
Effects of Weather on Habitat Selection and Behavior of Mallards Wintering in Nebraska
Dennis G. Jorde, Gary L. Krapu, Richard D. Crawford, and Miriam A. Hay
Phenotypic Variation of the Mexican Duck (anas Platyrhynchos Diazi) in Mexico
Norman J. Scott Jr. and Robert P. Reynolds
Winter Weight Dynamics, Grain Consumption and Reproductive Potential in Canada Geese
David E. Joyner, Robert D. Arthur, and Bruce N. Jacobson
Why Do Northern Mockingbirds Feed Fruit to Their Nestlings?
Randall Brettwisch, Peter G. Merritt, and George H. Whitesides
Comparative Food Habits of Bubo Owls in Mediterranean-type Ecosystems
Fabian M. Jaksic and Carl D. Marti
Activity Budgets of Foraging Gray-headed Albatrosses
Peter A. Prince and Michael D. Francis
Nest-site Selection by Masked and Blue-footed Boobies on Isla Espanola, Galapagos
David Cameron Duffy
Resource Use by Sympatric Kingbirds
Peter J. Blancher and Raleigh J. Robertson
Sulfur Amino Acid Nutrition during Molt in the White-crowned Sparrow. 1. Does Dietary Sulfur Amino Acid Concentration Affect the Energetics of Molt as Assayed by Metabolized Energy?
Mary E. Murphy and James R. King
Sulfur Amino Acid Nutrition during Molt in the White-crowned Sparrow. 2. Nitrogen and Sulfur Balance in Birds Fed Graded Levels of the Sulfur-containing Amino Acids
Mary E. Murphy and James R. King
Intentional Poisoning of Birds with Parathion
Ward B. Stone, Stephen R. Overmann, and Joseph C. Okoniewski
News and Notes
The Condor
Covers
Back Matter (PDF)
The Condor
Front Matter (PDF)
The Condor
Short Communications
Microclimate of Gull-billed Tern and Black Skimmer Nests
Gilbert S. Grant, Charles V. Paganelli, and Hermann Rahn
Thermoregulation in Newly Hatched Black-legged Kittiwakes
Claus Bech, Svein Martini, Rudi Brent, and Jorgen Rasmussen
Pelagic Red Crabs as Food for Gulls: a Possible Benefit of El Nino
Brent S. Stewart, Pamela K. Yochem, and Ralph W. Schreiber
Notes on the Speckled Crake (coturnicops Notata) in Brazil
Dante Martins Teixeira and Maria Esther Puga
The White Bellbird (procnias Alba) in the Serra Dos Carajas, Southeastern Para, Brazil
Paul Roth, David C. Oren, and Fernando C. Novaes
Three Records of Calliope Hummingbird from Louisiana
Nancy L. Newfield
Probable Identity of Purported Rough-legged Hawk Nests in the Western U. S. and Canada
Marc J. Bechard and C. Stuart Houston
Twin Embryos in a Peregrine Falcon Egg
Oliver H. Parte, William G. Mattox, and William S. Seegar