I was taking pictures out my spare bedroom window early on the morning of 10/28/11. I took three pictures at varied exposure compensation from -1, 0, +1 and set my camera to a 2 second delay to avert camera shake. I took the three pictures and did notice something fly past my window. Once downloaded I noticed a flock of bird had been caught on my second of three pictures. I combined in HDR Darkroom Pro and saw the ghost cast by the birds and decided to leave them in the HDR final picture.