Contents
The Photoperiodic Testicular Response of a Tropical Finch, Zonotrichia Capensis Costaricensis
August Epple, Gordon H. Orians, Donald S. Farner, and Robert Alan Lewis
Postnuptial and Postjuvenal Molt in Rufous-collared Sparrows in Northwestern Argentina
James T. King and E. Linwood Smith
Winter Foraging Ecology of Mixed Insectivorous Bird Flocks in Oak Woodland in Southern Arizona
George T. Austin and E. Linwood Smith
Reproductive Patterns in Captive American Kestrels (sparrow Hawks)
Richard D. Porter and Stanley W. Wiemeyer
Molt Cycles of Purple Martins (progne Subis)
David M. Niles
Nestling Development of Green Herons at San Blas, Nayarit, Mexico
T. Gonzalo Gavino and Robert W. Dickerman
Yellow-green Vireo in Arizona, with Notes on Vireo Songs
Donald L. Robbor
Ecology and Nesting Behavior of the Chestnut-backed Antbird (myrmeciza Exsul)
Edwin O. Willis and Yoshika Oniki
News and Notes
The Condor
Publications Received
The Condor
The Bulletin Board
The Condor
Covers
Back Matter (PDF)
The Condor
Front Matter (PDF)
The Condor
Short Communications
Observations on Two Rare Costa Rican Finches
F. Cary Stiles and Henry A. Hespenheide
Observations on Copulatory Behavior of a Pair of Screech Owls (otus Asio)
Lawrence B. Mcqueen
The Bran-colored Flycatcher in Guyana
James A. Dick and Jon C. Barlow
Anna's Hummingbird in Adult Male Plumage Feeds Nestling
Dale Peters Clyde
Influence of Disturbances in the Earth's Magnetic Field on Ring-billed Gull Orientation
William E. Southern
Chlorinated Hydrocarbon Residues and Reproductive Success in Eastern North American Merlins
Stanley A. Temple
Fall Nocturnal Migration during Two Successive Overcast Days
James J. Hebrard
Responses of Adult Killdeers to a Downy Young Distress Call
Donald B. Deckenlively
Adaptability and Site Tenacity in an Individual Starling
Penelope Williamson