7/23/07 - Big Bend Nat'l Park 20 miles from Terlingua, Tx - diamond shaped yellow craft in photographI was photographing a road runner on a desert road. I was not looking up at the sky. I was concentrating on the bird. When I examined my pictures, I noticed there was a large yellow craft in the sky. I never saw it. It is in my picture. It is not an artifact. when I blow it up it looks like it has depth, height and maybe a row of lights on the bottom. It is not an airplane. I was in the desert for a week and I didn't notice any aircraft, commercial or general aviation.If you want to see the photograph, let me know. I will e-mail it to you.I am not into UFO sightings or folklore. The craft is definitely in the picture.I am simply interested in an explanation of the craft.