I was at Downsview park on Sunday as well and saw at least 3 Red-tailed Hawks, along with a few Mourning Doves, Killdeer and plenty of Canada Geese
The behaviour of the hawks was mixed, some flew away while I was quite far away, while one was quite tolerant to my presence and let me get fairly close.
The hawk defintely knew I was there
But continued to clean and preen himself for about 10min
Before taking off...
At one point there were three soaring in the air above me at the same time, they seemed to be hunting a few small songbirds (unidentified) that were flying about
I also got some shots of the doves in the woods
and the 2 killdeer that were flying between the big pond and "the meadow" area up above
I was there in the morning/early-afternoon when I saw all these guys. There were some people flying remote controlled airplanes on the far side of the pond (over the rough dirt area) so I don't know if that scared off any of the birds in the area
Cheers,
Mike