While typical owls ( hereafter referred to simply as owls ) vary greatly in size , with the smallest species , the Elf Owl , being a hundred times smaller than the largest , the Eurasian Eagle-Owl and Blakiston 's Fish Owl , owls generally share an extremely similar body plan .
Its weight is a hundred times less than the largest , the Eurasian Eagle owl and Blakiston 's Fish owl .