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Intergeneric Hybrids in the Family Pipridae
Kenneth C. Parkes

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Reproductive Cycle of the Mallard Duck
Oscar W. Johnson

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Pterylosis of the Mallard Duck
Philip S. Humphrey and George A. Clark Jr.

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Population Movements of Birds
Richard F. Johnston

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The Breeding Cycle of the Yellow-bellied Seedeater in Panama
Cora C. Alderton

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Birds from the Miocene of Sharktooth Hill, California
Loye Miller

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Lipids in the Locomotor Muscles of Birds
Frank A. Hartman and Katherine A. Brownell

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Late Spring Observations on Birds of South Farallon Island, California
Robert I. Bowman

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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

Recent Records of Birds in Korea
Chester M. Fennell

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Scaled Petrel in Oregon
William M. Wallace

First Record of European Skylark on San Juan Island, Washington
James A. Bruce

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Recent Waterfowl Records for Colorado
Ronald A. Ryder and Laren A. Roper

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Cassin Finch and Pine Grosbeak in West-central Kansas
Charles A. Ely

Prairie Warbler Off the Pacific Coast of Guatemala
Edwin Willis

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The Amur Barn Swallow Off British Columbia
I. Mct. Cowan and Garry Mct. Cowan

Turkey Vulture Nesting in Pima County, Arizona
Wilson C. Hanna