I DEMAND AN EXPLANATION

This video has been around for almost a year now, and according to the stats has been viewed a staggering number of times (over 1.3 million), so chances are pretty good it's old news. But still.

I want an explanation for this.

What are these chickens doing? Who do they think they are, getting all up in these rabbits' business? Why do this? Do chickens have an innate drive toward the establishment of order? I need to know the reason for this behavior.