Praca przedstawia wyniki analizy 22 wypluwek uszatki błotnej Asio flammeus zimującej na Pomorzu Zachodnim. W badanym materiale wykazano szczątki kostne 72 ofiar – wyłącznie gryzoni. Podstawę diety stanowił nornik zwyczajny Microtus arvalis. Jego udział w diecie tej sowy wynosił prawie 85%, a biomasa 83%. Wyniki porównano z danymi z literatury uzyskanymi w okresach zimowych w latach 30. XX wieku na Dolnym Śląsku. W składzie pokarmu dolnośląskich uszatek błotnych również zdecydowanie dominował nornik zwyczajny (97% udziału i biomasy ofiar).
Presence of four owl species was confirmed in the area of Forest Experimental Station of WULS−SGGW in Rogów (central Poland) at the beginning of the 2000s. These were tawny owl, long−eared owl, little owl and barn owl. In the second half of the XX century migratory short−eared owls had also been recorded. Density of tawny owl territories per total area was 2.6/10 km2. For long−eared owl it was lower (1.5/10 km2). Little owls and barn owls were very rare and both species have probably decreased severely in the last several years. Despite fluctuations in the abundance of forest rodents, number of tawny owl pairs was reasonably stable throughout study time. In the case of long−eared owl its numbers varied between years.