Territorial Behavior of Short-eared Owls, Asio flammeus, at more than 1000 km North of their Current Breeding Range in Northeastern Canada: Evidence of Range Expansion?

摘要

A pair of Short-eared Owls was observed throughout the summer of 2008 showing territorial behavior more than 1000 km north of their known breeding range in north-eastern Canada. These observations might be related to high lemming densities and/or climate change occurring in the Arctic.