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Convergent Characteristics in Sympatric Species: a Possible Relation to Interspecific Competition and Aggression
Martin L. Cody

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Birds and the Ant X Acacia Interaction in Central America, with Notes on Birds and Other Myrmecophytes
Daniel H. Janzen

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Vocalizations of the Rufous-sided Towhee, Pipilo Erythrophthalmus Oregonus
Joan Beltz Roberts

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Seasonal Cycle of Reproductive Physiology in the Black-billed Magpie
Michael J. Erpino

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Food Habits of Canvasbacks, Redheads, and Lesser Scaup in Manitoba
James C. Bartonek and Joseph J. Hickey

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Respiratory Metabolism of the Red-winged Blackbird in Relation to Ambient Temperature
R. W. Lewies and M. I. Dyer

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The Song of the Chingolo, Zonotrichia Capensis, in Argentina: Description and Evaluation of a System of Dialects
Fernando Nottebohm

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Ecological Aspects of Migration, and Pre-migratory Fat Deposition in the Lesser Redpoll, Carduelis Flammea Cabaret
P.r. Evans

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News and Notes
The Condor

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Publications Received
The Condor

Cooper Ornithological Society Statement of Assets and Fund Balances Resulting from Cash Transactions
The Condor

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Summary of Cash Receipts and Disbursements and Changes in Fund Balances
The Condor

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The Bulletin Board
The Condor

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Back Matter (PDF)
The Condor

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Front Matter (PDF)
The Condor

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Recent Bird Records from the Virgin River Valley of Utah, Arizona, and Nevada
Roland H. Wauer

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Calculation and Miscalculation of the Equations Relating Avian Standard Metabolism to Body Weight
Robert C. Lasiewski and William R. Dawson