Last summer when our last beloved dog Loo-C died in July, it did not take very long for "other" types of pets...or pests, to move into the backyard. A large hornet or wasp nest was built rather quickly, and thankfully, was at the back of the yard, away from windows and doors to cause any havoc.
Most recently, we have a "group" of starlings building, what I think, is a rather large nest in an area under our roof that lost some siding in a storm last year (we are getting a new roof soon, and that exposed area will be filled in). The birds are loud, and quite industrious as they build their nest using insulation, twigs, decrepit leaves and debris from around our yard and beyond. We are not sure if they have flown the coop today because there was no activity of building or squawking. I actually found other birds perched on the gutter, perhaps contemplating it if they should check out the nest right beneath them (it did not happen while I was watching it all play out).
It really is quite fascinating on how the circle of life can be viewed right outside our windows, but frankly, I'd rather not see them building their nest under an exposed roofline.