UFO or bird photographed over Syracuse, NY?

On April 12, 2015, an American photographer has discovered on a picture taken Syracuse (seat of Onondaga County, New York) a very strange object looking like an unidentified flying object. But, if you watch this potential UFO more carefully, we can think that it’s just a bird. And you, what do you think?

Witness report:

I'm a photographer and was doing a general shoot of the city of Syracuse from the roof of a parking garage on State St downtown. I never noticed this until today when I was editing pictures from that day. I didn’t want to mark the picture at all but you can see it by zooming in to the lower left part of the sky.