Steve killed these rockchucks in seconds. Grabbed them by the neck, shook them, and that was that. Vicious growls. Didn't seem interested in eating them. He chases rabbits, but it seems like more of a fun pastime for him - he playfully barks as he chases them. I don't think he actually wants to catch them. He has brought live ducks back before, fairly unharmed. He catches and eats snow geese. He catches and tosses around voles and gophers and such for play. Unless they are in the backyard. That is the cat's territory and Steve knows better than to mess with Barney, who usually catches a gopher or vole per day.
He chased a fox around once for like 20 minutes. I think the fox was playing him, because the fox kept running back and forth through my paddock fences in loops, when he could have easily gone through a main fence and gotten away (which he eventually did).