I was driving down a little country road near Ft. Worth, TX. I pulled over to get a closer look at a sparrow and noticed the Harrier who was also watching the sparrow. I didn't notice him at first because he blended so well into the background. The photo was taken with a Nikon D300s and a Nikon 600mm lens.
About the bird species...
The Hen Harrier (Circus cyaneus) or Northern Harrier (in North America) is a bird of prey. It breeds throughout the northern parts of the northern hemisphere in Canada and the northernmost USA, and in northern Eurasia.
This medium-sized raptor breeds on moorland, bogs and (in Europe) farmland. The nest is on the ground. Four to six whitish eggs are laid.
This is a typical harrier, with long wings held in a shallow V in its low, contour-hugging, flight. Hen Harriers hunt small mammals and birds, surprising them as they drift low over fields and moors. This harrier tend to be a very vocal bird while it glides over its hunting ground.