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Front matter OB Vol 30 #1 Apr2012
Ontario Birds

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Back matter OB Vol 30 #1 Apr2012
Ontario Birds

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Colonial Waterbird Populations at the Leslie Street Spit/Tommy Thompson Park
Karen McDonald

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"Vega" Herring Gull in Algoma District: A new taxon for Ontario
Kirk Zufelt

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Early History of the Great Gray Owl in the New and Old World
Mikkola and Sieradzki

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Spring migration of Great Egrets into Ontario: an eBird analysis
D.V. Chip Weseloh and Tyler Hoar

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Changes in Summer Abundance and Distribution of Mute Swans along the Lower Great Lakes of Ontario, 1986-2011
Shawn W. Meyer, Shannon S. Badzinski, Michael L. Schummer, and Christopher M. Sharp