Small, black blur unknowingly captured on a digital camera photo.

A couple of other college students and I were on a hiking trip that started at about 8:00 am in the mountains along highway 243.  It was a perfectly sunny day with no clouds, maybe a little smog.  But I was just taking pictures of the scenery with my digital camera, and didn't even realize that there was a strange object in the middle of one of the photos I had taken (I put the photos on my computer a couple days ago).  I would have just shrugged it off except for the fact that I had taken an identical picture less than 30 seconds later and the object was no where to be see.  I don't recall there being anything in the photo at the time I had taken it, but then again, I wasn't expecting anything to be in it.  In the picture the weird object is just a small black blur that is right in the middle of the clear sky.  I'm not really sure what it is, or what it could be, so I wanted to contact someone to see if they could tell me what it is exactly.  I trust you guys are professionals in this field, and are a lot better at analyzing photos than I am.  I would really wish to be contacted by an investigator via email so that I can email him or her the image, but if this is not possible I understand.  Thank you for your time.