Contents
Observation on a Sooty Grouse Population at Sage Hen Creek, California
Robert S. Hoffmann
Integrating Mechanisms of Winter Flocks of Juncos
Winifred S. Sabine
The Molt and Testis Cycles of the Anna Hummingbird
Francis S. Williamson
Two New Birds from the Miocene of Florida
Pierce Brodkorb
Red-tailed Hawk and Horned Owl Populations in Wisconsin
Gordon Orians and Frank Kuhlman
Notes and News
The Condor
Cooper Society Meetings
The Condor
Covers
Back Matter (PDF)
The Condor
Front Matter (PDF)
The Condor
From Field and Study
A Collection of Panamanian Nests and Eggs
Emmet R. Blake
Land Birds at Sea Off Southern California
Andreas B. Rechnitzer
Footprint of a Bird from the Miocene of Louisiana
Alexander Wetmore
European Widgeon and Glaucous Gull in Utah
Vanez T. Wilson and Leo T. Young