It's impressive to watch the chickens in action as they dart in and peck down on the mouse. It's pretty much over for the mouse after that first swoop. But the chicken that did the killing then proceeds into a dance-like game of keep away with the other. Either the mouse gets torn in half and they each enjoy the spoils, or one of them swallows the mouse whole.
This is a video I shot recently of my two chickens fighting over a mouse. The darker chicken is Sarah Palin. The lighter is named Liz Lemon. The small dog barking is Baxter.