300,000 Birds Swarm Over Denmark At Once (VIDEO)

Have you ever seen 300,000 birds move at once? Buzzfeed posted this video of a massive flock of starlings swarming together over an unspecified area in Denmark, forming a dark, shape-shifting cloud. For all the Harry Potter fans out there, it bears a frightening resemblance to a Dementor.

How is it that a bunch of smaller objects can take the form of a larger object? Does the larger object maintain the sense of the original organic onjects that make it up? How do the gestalt principles account for these perceptions?

http://www.huffingtonpost.com/2009/11/08/300000-birds-swarm-over-d_n_350039.html