Sam, is the insulation piled up at the edge where the rafters go up? Small hole burrowed out in the pile. If so, may be squirrels nesting. I am having to deal with that now, and it about time for the little ones to be born. Some of those holes look like where the squirrels have been gnawing through my ceiling in the washroom.
I left some soffit open when I started siding my house. I am trying to figure what to do about this. Thinking of closing the soffitt with one escape area and rigging a one-way door trap. From what I have read, these things give birth twice a year. Early Feb being one of the times.
They can be very stubborn from what I read about reentering a nesting place.
I did wrap some used cat litter in some foil and toss the balls in the attic. Thought I had them gone for a couple of days. Not!
So I am here seeing what others have done in the same or similiar situation.
Kind of concerning when you think about the possibilty of coming in contact with a bare spot on a hot wire they have gnawed on.
I have had to replace a hose going to the pressure switch on the hvac once because they had gnawed on it. I have also seen gnawed on wiring. Squirrels, from what I have read, cause a lot of house fires.