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Correlations of Northern Saw-whet Owl Aegolius acadicus calling indices from surveys in southern Wisconsin, USA, with owl and small mammal surveys in Manitoba, Canada, 1986-2006

James R. Duncan, Auteur ; Scott R. Swengel, Auteur ; Ann B. Swengel, Auteur

Dans Ardea (97(4) 2009)

The Northern Saw-whet Owl Aegolius acadicus (NSWO) can be found year-round on its North American breeding range, but considerable numbers migrate south in autumn, with banding data documenting migration movements over 1000 km. Although the timin[...]

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