Which roof?
If you mean the McKenzie roof, because you probably can't see the clock tower roof with cam, they eat prey up there and Hurricane likes to sit at the bottom of the clock tower, especially when they have chicks. We never see them perched on the lower roof ledges or parapets, they could but I have never seen them perched there. When Zeus was here, he liked to perch on the black ledge on the east side where the cam can't see.
Hurricane eating on the northwest corner of McKenzie roof