Chicken fighting

I was in my house when I saw a chicken jumping outside my window.  I was like "whhaaaat??"  Chickens do strange things.  I looked outside and these two male chickens were fighting.  They would puff out their necks and jump at each other.  By the time I grabbed the camera, they saw me and stopped.  So I didn't get a picture of them jumping at each other.  The chickens around here are violent.  This is the first male on male fight I've seen over what I consider territory, but they fight over food all the time.  If there is something on ground and a chicken is eating it, another chicken will try and chase that one off.