Plumage colour polymorphism among central Poland's tawny owls Strix aluco Linnaeus, 1758

摘要

The results of research that was performed in central Poland in 2006-2011 on colour morphs in tawny owl (Strix aluco) are presented. Specifically, the work soughts to determine which of the two main colour morphs (rufous or grey) is most prevalent inthe study area. The results revealed similar proportions of both morphs in the study population: of 107 tawny owls that were observed, 51.4% were rufous and 46.7% were grey; two birds (1.9%) represented a transitional form.