If you called it a UFO and said it was taken from the desert (on earth) it would be birds 110% birds everybody ...yes its birds case closed move alone.. just has to be
If you called it birds on Mars its a unanimous OH ITS DUST!!! we are 110% sure of it... yes definitely dust
Actually birds usually look quite different. And they don't show up in the same place in the frame in different images. Dust does though.
edit on 8/16/2012 by Phage because: (no reason given)