A mulie grunt resembles a low drawn out clicking noise. I would say that the tone is about the same, just drawn out in mulies. When they get to grunting, they keep going and going. It is awesome to listen to. You should head out in November with a camera in hand. It could be very interesting! That way it would be possible to shoot as many deer in a day as your film will hold, and you can pack em out all at once :0)