Boreal owl (Aegolius funereus).
The acute hearing of these owls allows them to hunt small mammals who are hiding beneath vegetation and snow. Although these birds do not regularly migrate south, some years they do travel south of their breeding range in the winter, likely in search of more plentiful food. This nocturnal and unsociable bird is evasive and shy of humans, making it one of the species that humans know the least about.