Contents
Pterylography and Age Determination in the Orange-crowned Warbler
Mercedes S. Foster
A Re-examination of the Relation Between Standard Metabolic Rate and Body Weight in Birds
Robert C. Lasiewski and William R. Dawson
Pleistocene Birds from Fossil Lake, Oregon
Joseph R. Jehl
Castration and Spring Migration in the White-throated Sparrow
Charles M. Weise
Winter Feeding Program of Alaska Willow Ptarmigan Shown by Crop Contents
Laurence Irving, Geroge C. West, and Leonard J. Peyton
A New Subspecies of the Yacatan Flycatcher, Myiarchus Yucatanensis
Kenneth C. Parkes and Allan R. Phillips
News and Notes
The Condor
Covers
Back Matter (PDF)
The Condor
Front Matter (PDF)
The Condor
Communications
The Occurrence of Certain Flycatchers in California
R. Guy Mccaskie, Richard Stallcup, and Paul Debenedictis
The Ternery on Aves Island in March
James D. Lazell Jr.
Nest-robbing Behavior of the Sparrow Hawk
Gerald L. Richards
The Baird's Sparrow and Burrowing Owl in Missouri
David A. Easterla
Brown-headed Cowbird Collected Far at Sea
Gerald A. Sanger
Anna's Hummingbird in Southwestern Oregon
M. Ralph Browning and William English
First Record of the White-eyed Vireo in Panama
David L. Hicks