I was at the lake the other day and saw something
I had never seen before - two mallard ducks
fighting - rolling around, wings flapping, pecking away
at each other. A dog ran over to investigate and they
were completely oblivious to him, as they were to my camera.
After about 2 minutes of furious combat, one had enough and
fled the scene.

Perhaps it's the violence on television or graphic video games that is responsible.