Northern Saw-whet Owls (Aegolius acadicus) were captured in north central Oregon, USA, during autumn 1999 and 2000 as a pilot study on migration in the Pacific states. We captured 70 individuals, with annual capture rates comparable to those reported for larger studies in the eastern and Midwestern U.S. We investigated differential capture by time of night, time of season, and age. No results were significant due to small samples and brief duration of the study, although some results tended toward significance (P < 0.10). Here we provide a descriptive account of our observations of Northern Saw-whet Owl migration in north central Oregon, the first such study to be presented for the Pacific states.
Frye, Graham G. and Gerhardt, Richard P.
"Northern Saw-whet Owl (Aegolius acadicus) migration in the Pacific Northwest,"
Western North American Naturalist: Vol. 63
, Article 8.
Available at: http://scholarsarchive.byu.edu/wnan/vol63/iss3/8