Hedgehogs often comprise a fairly significant portion of the prey taken by Eurasian eagle-owls, both in numbers and biomass. At least eight species of hedgehog have been predated. The European hedgehog is often one of the most prominent prey species in eagle-owl diet studies from Europe, and was recorded as the most numerous prey species per researchers in parts of Denmark, Switzerland, Austria and south Germany. With an average weight of , the European hedgehog can comprise a very large portion of the biomass. A study of the Bavarian region of Germany, the European hedgehog (the main prey species) made up 41.7% of the prey by number and 52.1% of the biomass, the maximum representation of hedgehogs known in Europe. Other members of the genus Erinaceus are also locally regularly taken, as is the Daurian hedgehog (Mesechinus dauuricus) in Mongolia. Studies from Greece and the Czech Republic found that the northern white-breasted hedgehog (Erinaceus roumanicus) was the leading prey species. Unidentified Erinaceus hedgehogs almost totally dominated the diet of eagle-owls in Stavropol, Russia, making up 70.9% of the food, only the European rabbit has been found as more significant at the genera level by number in a given dietary study. Studies from both Syria and Kazakhstan showed that the long-eared hedgehog (Hemiechinus auritus) was the most significant prey, making up 25.3% and 33.6% of the prey remains, respectively. After killing hedgehogs, the Eurasian eagle-owls peel the prickly skin off their backs before consumption, frequently resulting in up to dozens of hedgehog backs being found around nests. Moles and shrews are readily hunted but are usually only a secondary portion of the diet. Eurasian eagle-owls have been recorded hunting the smallest mammal on earth (by weight) the Etruscan shrew (Suncus etruscus), as well as the largest mole on earth, the Russian desman (Desmana moschata). From the smallest shrew to the heaviest hedgehog, the Eurasian eagle-owl has been verified to hunt the full size range of insectivores. They've also attacked bats of every size available, from the smallest European bat, the common pipistrelle (Pipistrellus pipistrellus), to the largest species there, the greater noctule bat (Nyctalus lasiopterus). In the Sikhote-Alin range of the Russian Far East, bats were found to comprise 5.9% of the remains and, of five local owl species, the Eurasian eagle-owl was the most regular predator of bats in the area.