Surprise addition discovered in vacation photo.

While going through travel photos today, I have just noticed an odd craft-like object in one of them.  While visiting Spain in 2007, I took this photo of a mountain late in afternoon outside of a small roadside restaurant in the Andalucian mountains.
I Googled the restaurant name as seen in photo and came up with this address: Quesos Sierra Crestellina Juan Ocana Quirós (sp. N auf Ocana) Ctra. Manilva-Gaucin, km 13.5 229690 Casares, Málaga Spanien  The accompanying photo has all the camera meta information intact.  I have looked closely to see if it was somehow attached to a pole or wire from the restaurant below but it seems unlikely.  I did not notice this when taking the picture. It is quite by accident.
I am sending the original sized file for your observation.  The time on the photo is Chicago time and local time would be 6 hours later, or 17:33 pm.
I do suspect it is blimp-like but there are no visible markings and is quite reflective.
Hope it is helpful and interesting to your studies.
Regards
The object may be a bird in flight, with its wings folded.  PD