Athens Mosaic - a Cavalry, After Effects and Illustrator combo.
The base animation was made up of individual frames of the horse, and then composited into After Effects, Cavalry did the rest!
I made this animation in a morning.
The vector illustrations took less than an hour each, and were converted into paths. After watching a few videos of birds in flight and flowers blooming, I animated the paths.
I did cheat a little and use Illustrator Beta's new Turntable...