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THE WILSON JOURNAL OF ORNITHOLOGY . Vol. 123. No. 2. June 2011 
America (Holroyd et al. 2010). The dispersal 
movement of the female Burrowing Owl reported 
in this paper crossed between these two migration 
‘corridors' from Arizona to Saskatchewan. 
Our observation indicated this burrowing owl 
dispersed 1,860 km between two nesting attempts 
within the same breeding season. This is the 
longest distance ever recorded for breeding 
dispersal for any raptor (and possibly for any bird 
species) within the same breeding season. The 
female was not seen again the following year on 
either study site. The possibility of other species 
dispersing between two nesting attempts in the 
same breeding season has been indicated by stable 
isotope analysis (Hobson and Robbins 2009, 
Rohwer et al. 2009). We suggest the possibility 
of other examples of long distance breeding 
dispersal events within the same breeding season 
should be investigated. These dispersals have 
important implications for population genetics 
(Korfanta et al. 2005) and population dynamics 
(Clobert et al. 2001, Wiens 2001). 
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ACKNOWLEDGMENTS 
We thank L. A. Ellis who trapped the owl in Arizona. 
Kelly Gray who first saw the owl in Saskatchewan and 
recognized the band was unique to Canada. J. M. Duxbury 
tor trapping the ternalc to read the band, and A. M. Fucntcs 
Romero and M. Marquez Olivias for permission to publish 
their observation of two broods near Mexico City. Fundiim 
was provided by Environment Canada's Species at Risk 
Fund. Government of Canada's Interdepartmental Recovery 
thronoh r Fish and WUdlif * foundation 
through Beaverh.il Bird Observatory. Arizona Game and 
Fish Department, I S. Geological Survey, and the National 
Science and Engineering Research Council of Canada. This 
note benefited tram reviews and citations by J. H. Barclay 
T. H. L. Fleming. A. E. Sieradzki. R. W. N. Knapton. C E 
Boal. and two anonymous referees. Use of trade names is 
tor descriptive purposes only and does not imply endow¬ 
ment by the U.S. Government. 
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