Assertion: tawny owl's prey | /r/CapableOf | average 392 g
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text: Such prey have included adults of Northwestern crow (Corvus caurinus), averaging 392 g (13.8 oz), two large adult ruffed grouse (Bonasa umbellus), estimated to weigh slightly over 600 g (1.3 lb), and even apparently at least once an adult sharp-tailed grouse (Tympanuchus phasianellus), which average a relatively huge 885 g (1.951 lb) or three times heavier than an average long-eared owl.