フクロウ
This is a fairly powerful species of owl. However, like owls of nearly all sizes, mostly it prefers to take small prey relative to itself, especially small mammals. In a great majority of dietary studies, somewhere between 50 and 95% of the food is mammalian. Prey consists mostly of various species of rodent, though shrews and, locally, moles can be a regular food source as well. In additional, any variety of small mammal, to the size of hares (albeit usually young ones), may too be fairly often taken, as well as variable numbers of birds, amphibians and invertebrates, with reptiles and perhaps fish being very rare prey. Across the wide distribution, the Ural owl is known to take more than 200 prey species, of which more than 80 are mammals. In a compilation study of the diet in three European study areas and four different years found that the mean prey body mass taken per nest was estimated to vary from with an average estimated at .