Contents
Temperature Regulation in Laysan and Black-footed Albatrosses
Thomas R. Howell and George A. Bartholomew
Helpers among Birds
Alexander F. Skutch
The Hatching Muscle in North America Grebes
Harvey I. Fisher
Comments on Types and Taxonomy in the Jay Genus Aphelocoma
Frank A. Pitelka
Territorial Relationships Between Cardinals and Pyrrhuloxias
Patrick J. Gould
Birds Observed during Two Crossings of the Pacific Ocean
Daniel C. Wilhoft
Notes and News
The Condor
Covers
Back Matter (PDF)
The Condor
Front Matter (PDF)
The Condor
From Field and Study
Western Grebe Colonies in Northern Colorado
Donald G. Davis
The Flight Speed of a Red-breasted Merganser
Max C. Thompson
Publications Reviewed
The Kirtland's Warbler, by Harold Mayfield
Alden H. Miller