Flying saucer or bird over Guatemala City?

On May 15, 2011, a possible flying saucer has been photographed over Guatemala City. Witness didn’t see this UFO until he looked picture.

Witness report:

Actually I didn't see the UFO with my own eyes, I saw it in the picture when I downloaded my pictures to my computer that day at home. I took the picture of the Guatemala flag (it's my habit to take pictures of the flags I visit). I was living in Venezuela back in 2009 and I didn't notice the UFO until I showed the pictures to my wife back at home that day. I just heard about The Mutual UFO Network today, that's why it took me so long to report it. That's all. Thanks.