Dietary biology of the Eurasian eagle-owl but none are heavier than the largest mammalian prey that eagle-owls have taken including greater white-fronted goose ("Anser albifrons"), bar-headed goose ("Anser indicus"), great cormorant ("Phalacrocorax carbo"), Himalayan snowcock ("Tetraogallus himalayensis") and demoiselle crane ("Anthropoides virgo"), all averaging around , the swan goose ("Anser cygnoides"), the common crane ("Grus grus") and the (between the dimorphic sexes) great bustard ("Otis tarda"). Eurasian eagle-owls have also hunted adult male western capercaillie, which average about , although usually the much smaller females, at , are more regularly taken. Although they rarely take domestic birds, the range of sizes killed is just as dramatic,
Blastobasis tarda sexually dimorphic. Blastobasis tarda Blastobasis tarda is a moth of the family Blastobasidae. It is found in Australia in Queensland and New South Wales, as well as New Zealand. It is an introduced species in North America, where it has been found in southern California. It has also been reported from France. The wingspan is about 15 mm. Adults have brown forewings with fringes along the inner margin that are longer than the width of the rest of the wing. The hindwings are paler and narrower and have fringes along the costa and even longer ones along the inner margin.