The further information about the snowy owl hunting ducks and scoters on the open ocean at night really amazed me! Otherwise, I was not surprised by the all-of-the-above approach including crawfish, insects, voles, etc. with a bit of variation from owl species to owl species.
I keep thinking about how the Northern hawk owl looks so much like the northern Harrier, one of my favorite raptors. I do so love their ability to move so incredibly slowly, low over a field, appearing to defy gravity as they barely move forward but barely flap their wings. I like the owls that hunt that way, I suppose. Especially impressive is the Great Grey Owl when he glides over the snow listening for prey.
My dream is to see a Great Gray Owl. They are somewhere in the Blue Mountains in Oregon but birders keep spots pretty secret. Someday! I've only in recent years finally seen owls: Northern Pygmy Owl at a campsite this fall, plenty of Barn owls flitting by in rural areas, burrowing owls in Colorado and Eastern Oregon, Barred Owls are somewhat common even just hiking around the Portland Metro Area, and several Great Horned Owls at our lovely Ridgefield NWR. Here's a shot of what I think is a juvenile: