Admittedly we don't have the squirrel problem that you have in the GTA -- we get reds and chipmunks (obviously not in the winter) and neither in huge numbers (at most, max. of 5 each at any given time and they keep each other occupied b/c they chase each other around)...in fact...they are welcome at the feeders...I find the reds help disperse the seed a little for those that like to ground feed -- but I have one of those tall mark Cullen feeders...2 vertical compartments...perches and openings up the height of the feeder....and I notice that the few eastern greys that do occasionally visit don't have any luck with it...