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The Wilson Bulletin, Volume 81, Number 1 (1969)

Wilson Bulletin
1 (March)


A Study of the Rufous-Fronted Thornbird and Associated Birds. 5-43.
Alexander F. Skutch
Summer Biology of the Gadwall at Delta, Manitoba. 44-54.
Lewis W. Oring
The Radius and Relationship of Owls. 55-68.
Walter J. Bock, Allan Mcevey
Responses of Blue-Winged Warblers and Golden-Winged Warblers to their Own and the Other Species' Song. 69-74.
Millicent S. Ficken, Robert W. Ficken
Territorial Stability in Sharp-Tailed Grouse. 75-78.
Roger M. Evans
Hatching Behavior of the Bobwhite. 79-86.
Robert A. Johnson
Behavioral Ontogeny of the Mockingbird. 87-93.
Robert H. Horwich
Ornithological News. 109.
Ornithological Literature. 110-119.
Austin L. Rand
Letters to the Editor. 119-120.

General Notes

A Case of Turkey Vulture Piracy on Great Blue Herons. 94.
Stanley A. Temple
Unusual Cases of Re-Nesting Mallards. 94-96.
Anders Bjarvall
Build-Up of Grit in Three Pochard Species in Manitoba. 96-97.
James C. Bartonek
Time Frequency Between Successive Drumming Performances of Ruffed Grouse. 97-99.
Walter L. Palmer
Increase in Herring Gull Colony in Cape May, New Jersey. 99-100.
Salvatore F. Bongiorno, Jeff Swinebroad
Barred Owl Feeds on Crow. 100-101.
Charles R. Sindelar
Behavior of a Ruby-Throated Hummingbird in a Room. 101-102.
Edwin C. Franks
Egg Measurements of California and Ring-Billed Gull Eggs at Miquelon Lake, Alberta, in 1965. 102-103.
Kees Vermeer
House Sparrow Occupancy of Cliff Swallow Nests. 103-104.
David E. Samuel
Factors Influencing Breeding Range Expansion of the Azure Bluebird. 104-105.
J. David Ligon
Plastic Device Causes Gull Mortality. 105-106.
Scoot C. Rea
Distraction Display of a Pair of Black-Throated Green Warblers. 106-107.
Douglass H. Morse
Meadowlarks Feeding on Road-Kills. 107-108.
John P. Hubbard, Claudia L. Hubbard

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