Contents
On Latitudinal Gradients in Avian Diversity
Elliot J. Tramer
History and Ecology of a Colony of Barn Owls in Utah
Dwight G. Smith, Charles R. Wilson, and Herbert H. Frost
A Biometric Analysis of Oriole Hybridization
R. K. Misra and Lester L. Short
The Avian Egg: Incubation Time and Water Loss
H. Bahn and A. Ab
The Avian Egg: Water Vapor Conductance, Shell Thickness, and Functional Pore Area
A. Ar, C. V. Paganelli, R. B. Reeves, D. G. Greene, and H. Rahn
The Phenology of the Nesting Season of the American Robin (turdus Migratorius) in the United States
Frances C. James and H. H. Shugart Jr.
The Pleistocene Rails of North America
Storrs L. Olson
Calculating the Nocturnal Energy Expenditure of an Incubating Anna's Hummingbird
W. K. Smith, S. W. Roberts, and P. C. Miller
Seasonal Variation in the Metabolism and Thyroid Activity of the Black-capped Chickadee (parus Atricapillus)
James D. Rising and Jack W. Hudson
Review of the Status of the Yellow-billed Cuckoo in California: Sacramento Valley Populations
David Gaines
News and Notes
The Condor
Publications Received
The Condor
The Bulletin Board
The Condor
Cooper Ornithological Society
The Condor
Covers
Back Matter (PDF)
The Condor
Front Matter (PDF)
The Condor
Short Communications
Notes on the Structure of the Upper Eyelid of Potoos (nyctibius)
Jose Iganacio H.
The Autumn Diet of Spruce Grouse: a Regional Comparison
Fred C. Zwickel, D. A. Boag, and J. H. Brigham
Flight Displays in Two American Species of Buteo
John P. Hubbard
A Courtship Flight of the Swainson's Hawk
Richard R. Olendorff
Increased Mortality of Cooper's Hawks Accustomed to Man
Helen A. Snyder and Noel F. Snyder
A Melanistic White-tailed Tropicbird
Storrs L. Olson
The Use of Western Harvester Ant Mounds as Strutting Locations by Sage Grouse
Keith I. Giezentanner and William H. Clark
Function of Eye Coloration in North American Accipiters
Noel F. Snyder and Helen A. Snyder
Barred Owl Records in Western Montana
David S. Shea
Reproductive Aspects, Growth, and Development of Greenland Mallards
Raymond J. Greenwood
Seasonal Predation on Moles by the Red-tailed Hawk
John C. Hafner
The Inheritance of Clutch Size in the Great Tit (parus Major L.)
C. M. Perrins and P. J. Jones
An Unusual House Sparrow Roost
Carl D. Marti
Predation of Xantus' Murrelet by Western Gull
Robert D. Oades