This used to be my wallpaper, The Homing Pidgeon soceity released hundreds of thousands of birds simultaneously, each set of pirds trained to return to their respective owners, during a huge celebration in the Netherlands, I think.

The exact details are sketchy it's been a while since I got this image, and I unfortunately do not know the artist's name.

(click to see full size, otherwise your just not seeing it the way it should be.)