Have had really good success with female howls than wait and listen, if nothing than male howls (smoke howl on LD) wait again, if nothing than an old male howl, wait and if nothing go to pup distress, fights, I go through about 3 or four of them sequentially at times. Been batting a good .750ish with that lately. Usually start the stand with a few prey sounds just to see whose hungry of course and play into there's some interloper in my territory eating my food when following up with the howls type thinking.