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Salt Utilization in the House Finch
Thomas L. Poulson and George A. Bartholomew

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Nesting of the Birds of Morelos, Mexico
J. Stuart Rowley

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The Swaying Display of the Red-eyed and Other Vireos
Val. Nolan Jr.

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A Systematic Study of the Red-backed Hawks of South America
Charles Vaurie

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Some Physiological Correlates of Pintail Reproductive Behavior
Richard E. Phillips and Ari Van Tienhoven

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The Taxonomic Status of the Hummingbirds Chalybura Melanorrhoa and Chalybura Urochrysia
Eugene Eisenmann and Thomas R. Howell

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A New Orchard Oriole from Mexico
Robert W. Dickerman and Dwain W. Warner

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Modification of Body Temperature by Activity in Brazilian Hummingbirds
Peter Morrison

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Notes and News
The Condor

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Officers and Members of the Cooper Ornithological Society
The Condor

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Back Matter (PDF)
The Condor

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Front Matter (PDF)
The Condor

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The Energetics of Migrating Hummingbirds
Robert C. Lasiewski

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Notes on Some Birds of the State of Michoacan, Mexico
John Davis

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Associations of Cave Swallows with Cliff and Barn Swallows
James Baker

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A Plucking Experiment with White-crowned Sparrows
Martin L. Morton

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Notes on the Food Habits of the Great Horned Owl in Western Oklahoma
Sanford D. Schemntiz and Ernest Ables

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Lapland Longspur in Mexico
Richard C. Banks