A realistic flock of birds to use in your project. See an example here: http://www.istockphoto.com/file_closeup.php?id=11865435. Some instructions for use: There are several options here. Just mask out the sections you don’t need, and use the “darken” compositing mode to place the bird silhouettes over your footage (without the white). Then, just animate the flocks to move from one side of your frame to the other. TOP LEFT: Raw bird animation, for making your own flock. TOP MIDDLE: Same thing, but with some movement, for extra realism. TOP RIGHT: Flock option #1. BOTTOM: Flock option #2. This one has birds moving at different speeds for added depth.