Two Male Black-Eyed Juncos

I'm pretty sure that I was witnessing some kind of duel between these two male black-eyed juncos a few days ago on my porch. They landed for the birdseed, and they squared off in a chirping match against each other. It was quite something to watch. The action was taking place so quickly (these birds were moving!) that I could only get one exposure (I actually set my camera to speed priority mode and let her roll...), but I ran the one exposure through Photomatix 5 (nice upgrade from version 4) and got a little bit of tonemapping action out of the deal. I sent the resulting tif file through Aftershot Pro to straighten/crop, and the result is as follows: