Related to the family group thing, when they were howling last fall, it sounded like at least like 4-5 individual animals. There is certainly plenty of game to support a larger pack where they are located.
I did call one of them January, just didn't know it until I stood up. I went to move to my next stand and there it was just standing behind me about 15 feet away. My shotgun of course had already been slung. 
