Distribution
Three subspecies exist across the northern holarctic. The North American subspecies S.u.caparoch spans from eastern Alaska through to Newfoundland and in some areas extends south into northern United States. The other two subspecies are found in Eurasia: S. u. tianschanica breeds in central Asia reaching Xinjiang (China) and S. u. ulula resides across Eurasia reaching Siberia at its most eastern range.
Occasionally, S.u.caparoch can extend its territory as far south as northern Minnesota and many other states in the northern United States including more central states such as West Virginia, New York, and South Dakota. These southern forays into the northern United States are rare and generally occur during winter, or following an explosion in a population of prey. S. u. caparoch has been known to reach Great Britain. As in North America, the Eurasian subspecies can occasionally be found in more southern areas such as the following: Great Britain; and southern Russia and Scandinavia, following explosions of prey.
Read more about this topic: Northern Hawk-Owl
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