I took this video of a great horned owl while taking an early morning row in our lake. I noticed the owl in a distant pine tree thanks to persistent cawing from a flock of crows. Crows are constantly monitoring their territory for owls, eagles or other potential predators. When they find one, they harass it until it flies away. That's what happened to this owl. Shortly after the video ends, the crows - you can hear their cries throughout the video - chased the owl away.
Below is another video of an owl made while walking through the woods last November. This one is a barred owl sitting in a tree on a different part of our property.