This is the tree in front of my place and what I can see from my front balcony.
Sketched today, you can see the squirrel's nest in the branches. Originally built two years ago, the leaves were dried and abandoned, especially since the city pruning last year. But this year a brave squirrel has taken possession of the old place and is doing a bit of a renovation. I can hear him crunching in the old leaves (not sure if that makes the best foundation, but probably just as good as the rest of Montreal's sinking foundations and crumbling ciments).