In a small green "pasture" on the south side of the 401, immediately East of Creditview Road and along the East shore of the Credit River.
http://g.co/maps/tnbppI have spotted a few here from time to time, sometimes just a pair, often 4.
This sighting there were 10. Very nice to see in this "city" setting. I believe there might be a footpath / trail into this area and may scope that out.