How big can owls get?

How big can owls get? We have a huge one in our neighborhood. And it has a 6 foot wing span. Someone had it in their front yard. It only comes out in the daytime. I thought they were nocturnal. IT is HUGE!!!!!

It depends on the owl species. The smallest owl species is the elf owl. They can grow to be between 13 and 30 cm tall. The largest owl species is the Eurasion Eagle Owl, which can grow between 58 and 71 cm long.