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Evolution of Brood Parasitism in Altricial Birds
William J. Hamilton III and Gordon H. Orians

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Bioenergetics of Lipid Deposition in the Bobolink, a Trans-equatorial Migrant
Cameron E. Gifford and Eugene P. Odum

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The Summer Birds of the Forests of the Mogollon Mountains, New Mexico
John P. Hubbard

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The Influence of Daylength on Reproductive Timing in the Red Crossbill
Harrison B. Tordoff and William R. Dawson

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Differential Timing and Routes of the Spring Migration in the Hammond Flycatcher
Ned K. Johnson

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Additional Hybrids of the Slate-colored Junco and the White-throated Sparrow
Lester L. Short Jr. and Stephen W. Simon

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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 Western Gull with Symmetrical White Wing Patches
Joseph G. Strauch Jr. and William Thackaberry

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The Curve-billed Thrasher in California
Guy Mccaskie and Robert R. Prather

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Additional Records for the Stolid Flycatcher on St. John, Virgin Islands
George A. Hall

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The Pine Warbler in Kansas
David A. Easterla

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A Southern Extension of the Breeding Range of the Vesper Sparrow in California
Eugene A. Cardiff

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Bird Records from Southern Nevada
George T. Austin and W. Glen Bradley

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An Abundance of White-tailed Kites in Sonoma County, California
Gordon L. Bolander and John R. Arnold

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Field Feeding of Whistling Swans in Northern Utah
John Nagel

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The Starling in Guanajuato, Mexico
Walter R. Donagho

Wintering Rufous-crowned Sparrows Found in Utah
Roland H. Wauer