Duck Fight At The OK Corral

One of these two mallards is a lot lighter in the tail feather area having had a few beakfuls pulled out by the aggressor after being chased around the yard for 20 minutes or so.  I was hoping the losing duck would just fly away but he didn't.  I suspect it's all part of some territorial challenge.  They both survived but I must admit to being a bit worried for a few minutes.  There was even a Canada goose in the mix but they ignored him.  Wildlife is wild!