“When a lion stalks a herd, he sneaks in close, lies down, and surveys them to choose his victim. He takes his time. The deer or buffalo have no idea he’s near. He finds his prey and then he explodes from his hiding place and grabs it. Even if another, perfectly serviceable animal ends up within his reach, he isn’t going to alter his course. He has chosen, and he would rather go hungry than change his mind.”