Why are they Fighting?

I have never seen anything like this. These weird birds attacking each other with one that is a referee. Why would they do this and what are they?
http://www.youtube.com/watch?v=iKxzIiTdcqk&feature=feedu

beva512011-11-02T09:00:58Z

The two birds fighting would be males and the "referee" is probably the female
who is slightly larger, she is watching to see who is the strongest/smartest
so she will know who to mate with for the best chance of her young to survive.
Don't know what they are but look like a ground fowl/bird in colouring.
Hope this Helps!

Rachel Atwood2011-11-02T07:49:20Z

some birds fight for territory or a mate or food that may be one of the reasons for fighting but that's nature

Luba2011-11-02T07:43:26Z

maybe for food or teretory or fun idk but sum will

Anonymous2011-11-02T07:46:22Z

idk