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Contents

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Arils as Food of Tropical American Birds
Alexander F. Skutch and John W. Fitzpatrick

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Additions to the Avifauna of Bolivia
J. V. Remsen and Robert S. Ridgely

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A Necropsy Procedure for Sampling Disease in Wild Birds
Charles Van Riper III and Sandra G. Riper

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News and Notes
The Condor

Covers

Short Communications

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Metabolism and Thermoregulation in Hatchling Western Gulls
William R. Dawson and Albert F. Bennett