Re: Hoping for a voluntary eviction
How about putting up a squirrel house on a nearby tree? They'll be looking for somewhere else to go - whether because of your attempts to evict them or because the tree comes down. Given the time of year, sooner is better than later. I'm also wondering if that tree might also be where they have stashed some of the food they've gathered for the winter. You might consider providing food for them through the winter until they again have access to their own natural "kitchen..."
Jamie
"some old things are lovely, warm still with life ... of the forgotten men who made them." - D.H. Lawrence