Wysoka liczebność pustułki Falco tinnunculus w Dolinie Mławki (Nizina Północnomazowiecka) w roku 2020

In 2020 a high breeding abundance of the Common Kestrel Falco tinnunculus was documented in the valley of the Mławka River in the North Mazovian Lowland. 35-36 breeding pairs were recorded on the 100 km2 area, of which 31 pairs were within the Natura 2000 SPA “Doliny Wkry i Mławki” (Fig.). Most of the occupied nests were located on poplars (Table). Broods of kestrels were also recorded in low-lying nests, which is less common in the country, of the Magpie Pica pica, built in shrubs of the grey willow Salix cinerea and common lilac Syringa vulgaris. Kestrels nested locally in loose clusters. In the vicinity of Proszkowo, 11 occupied nests were recorded on an area of 4 km2. A large number of nesting kestrels was probably the result of the high food abundance in the Mławka Valley in 2020.