Been doing my geography, All the houses and people hang out on ward / center / Algonquin island part of the Toronto islands.
"Cormorants have overtaken a peninsula of Toronto's Leslie Street Spit, which, thanks to aggressive nest building, is barren but for one tree. (May 13, 2009)" from the Toronto Star.
Now if the cormorants took over the Algonquin island where the houses are you thing they would all still be there.