During the winter we see more and more of these on the Great Plains. Northern Harriers are lots of fun to watch as they skim the surface of fields, hunting for a meal. They are tough to capture pictures of as they are so fast and fly very low to the ground.
This particular male, a Gray Ghost, gave me a couple nice passes recently. I was shooting into the sun so that made for a tough exposure but the images came out pretty good. Taken at the Rocky Mountain Arsenal National Wildlife Refuge near Denver, Colorado.