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Territorial Behavior of the Tree Sparrow
J. Stenger Weeden

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The Breeding of the Red-billed Tropic Bird in the Galapagos Islands
David W. Snow

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Adaptation of Heart and Lung Weight to High Altitude in the Robin
William A. Dunson

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The Molt of Breeding Cassin Auklets
Robert B. Payne

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Nest Construction by House Wrens
Robert A. Mccabe

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Life History Notes on Two Tropical American Kites
Alexander F. Skutch

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Sensory Mechanisms and Environmental Clues Used by the American Robin in Locating Earthworms
Frank Heppener

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Chance Distribution of Cowbird Eggs
Harold Mayfield

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Notes and News
The Condor

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Back Matter (PDF)
The Condor

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Front Matter (PDF)
The Condor

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A Spectacular Case of Cnemidocoptiasis (scaly-leg) in the White-breasted Nuthatch
John William Hardy

Unusual Bathing Habits of the Turkey Vulture
Mike Mckelvey

Northern Limit of the Acorn Woodpecker
Jared Verner

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Two Western Occurrences of the Orchard Oriole
John P. Hubbard

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Physiological Aspects of the Onset of Molt in the Redwinged Blackbird
William A. Dunson

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Goshawk Nesting in the Upper Sonoran in Colorado and Utah
Clayton M. White, Gary D. Lloyd, and Gerald L. Richards

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Specimens of Nuttall Woodpecker from Oregon
L. L. Short Jr.

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A New Dictionary of Birds, Edited by Sir A. Landsborough Thompson
John Davis