I spotted a large white bird of prey in Centennial Park, near Pearson Airport yesterday (April 12, 2016).
I've never seen a bird quite like it. All white at a distance, but had a couple of dark streaks on tail (noted through binoculars). It looked like a hawk, though it did have a bit of a rounded head. The head seemed small enough compared to the shoulders to be a hawk, not an owl. ?? The beak was not as "hidden" as I'd expect on an owl. I didn't get to see its eyes. It had tawny/brown vertical streaks on its head.
Not sure what I saw, and I've never seen snowies around there into mid-April. Was it most likely a snowy?