Contents
Reproductive Biology of the White-crowned Sparrow, Ii. Environmental Control of Reproductive and Associated Cycles
Robert A. Lewis
Experimental Modification of Reproductive Performance by Density in Captive Starlings
Arthur C. Risser Jr.
The Nesting and Reproductive Success of Red-tailed Hawks and Red-shouldered Hawks in Orange County, California, 1973
James W. Wiley
Prostitution" Behavior in a Tropical Hummingbird"
Larry L. Wolf
Song Dialects in Several Populations of Mountain White-crowned Sparrows (zonotrichia Leucophrys Oriantha) in the Sierra Nevada
Jorge E. Orejuela and Martin L. Morton
An Inconsistency Between Protein Resemblance and Taxonomic Resemblance: Immunological Comparison of Diverse Proteins from Gallinaceous Birds
Richard A. Nolan, Alan H. Brush, Norman Arnheim, and Allan C. Wilson
Thermal Exchange Between Sharp-tailed Grouse (pedioecetes Phasianellus) and Their Winter Environment
Keith E. Evans and Aaron N. Moen
Digestive Adaptations of Phainopepla Nitens Associated with the Eating of Mistletoe Berries
Glenn E. Walsberg
Weather-dependent Foraging Behavior of Some Birds Wintering in a Deciduous Woodland
Thomas C. Grubb Jr.
Songs of the Rufous-sided Towhee
Donald J. Borror
The Migrations of Allen's and Other Hummingbirds
Allan R. Phillips
News and Notes
The Condor
Selected Recent Publications
The Condor
The Bulletin Board
The Condor
Covers
Back Matter (PDF)
The Condor
Front Matter (PDF)
The Condor
Short Communications
Correction Factors for Digestion Rates for Prey Taken by Snow Buntings (plectrophenax Nivalis)
Thomas W. Custer and Frank A. Pitelka
Use of Tundra Habitats by Prairie Falcons in Colorado
Carl D. Marti and Clait E. Braun
The Occurrence of Twin Waterfowl Embryos
Bruce D. Batt, James A. Cooper, and George W. Cornwell
The Fox Sparrow in Southwestern Yukon and Adjacent Areas
J. Dan Webster
Time Budget and Foraging Site Preference of the Cinnamon Hummingbird in Costa Rica
Douglas W. Schemske
Recent Observations on the Birds of Isla Contramaestre and Isla Magdalena, Straits of Magellan
David F. Parmelee and S. D. Macdonald
First Nest Record of the White-winged Crossbill in Hispaniola
Angela K. Kepler, Cameron B. Kepler, and Annabelle Dod
Rose-throated Becard in Jeff Davis County, Texas
Steve R. Runnels
Selective Effects of Predation in a Tern Colony
I. C. Nisbet
Hunting by the White-tailed Kite (elanus Leucurus)
J. Sauve Warner and Robert L. Rudd