Northern Hawk Owl
Scientific name: Surnia ulula
With its northern breeding range and only occasional or local winter movements as far south as the northern U.S. during winter, the Northern Hawk Owl has not been well studied. Winter invasions of Northern Hawk Owls to the south of the breeding range usually follow successful breeding seasons with subsequent winter food shortages.
Northern Hawk Owls are thought to breed at one year of age, but in years of poor food supply they may not breed at all. Fluctuating rodent populations therefore have major impacts on both winter movements and nesting success. Northern Hawk Owls are known to have lived up to 10 years in the wild.