The Bard Owl was the largest bird I photographed and very sleepy. This is the best shot I could get. In most of my photos, he/she had his eyes half closed. I did get a chance to see it's additional protective eye lids.
I really liked the Barn Owl (without the barn!) What a face! Barn owls are one of the most common type of owls and are found all over the world.
This little owl is an Eastern Screech owl. They are very small and fairly common in the eastern United States. I've photographed several of them before including one in my September 6, 2013 and April 23, 2012 blogs if you want to see more.
The long eared owl has asymmetrical ear tufts. The ears don't line up perfectly, which helps them locate their prey. The left ear is higher than the right.
A good online source of information about owls is All About Birds.