Red Tailed Hawk

I agree. The Patagial markings are quite diagnostic.

The light-coloured bird of prey in question is a Red-tailed Hawk. This can be positively identified as one for two reasons. First, the tail is noticeably reddish in colour. Second, the bird has dark patagial bars (the area on the leading edge of the wing, between the 'shoulder' and the 'elbow'). Any hawk you see with dark patagial bars in Canada is a Red-tailed Hawk.