Wyniki inwentaryzacji włochatki Aegolius funereus w kompleksie leśnym w zachodniej części Nadleśnictwa Przasnysz

In 2013-2015 the survey of the Boreal Owl Aegolius funereus was carried out in a large forest complex in the Przasnysz Forest District within the Mława Heights in the North Mazovian Lowland (N53.232891, E20.710468). Each year all tree stands older than 80 years were controlled within the entire forest complex covering 90 km2. In different seasons, from 4 to 6 territorial males were detected. All sites were in the northern part of the complex in the so-called Oak Mountains. The number of breeding pairs was not estimated.