Very common along the West Toronto Railpath. At least that's where I've seen/heard them the most. Usually hanging out on the light / utility poles or sculptures. I've never seen them get aggressive though.Are mockingbirds common around the city? Maybe I just haven't noticed them before seeing this one a few times recently. In reading about them, they have a reputation for being noisy and aggressive, though this one has been silent and timid so far.