Quote:
Originally Posted by redforever
Doubt it. Average Great Horned Owl is a little bigger and they have ears...poster never mentioned ears.
I wouldn't describe a Great Horned Owl as being fairly white either...poster did.
I would go more with a Peregrin falcon.
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Maybe you should do some research on Raptor's... Female Peregrine's are typically the same size as a common Raven while the Tiercel is slightly larger than a 'large' Crow. A PF would also not be perched on a residential house, when dark diving into a yard. PF's almost strictly eat avian prey which they procure most often from a stoop. Canadian GHO's are typically darker but there are lighter morphs that have been documented in the Calgary area. Younger GHO's are also considerably lighter than adults. GHO adults are also 16"-24" in height, PF's not. The behaviour (sitting on roof and diving into yard in the dark) and description that Cecil provided sure allude to an Owl. Snowy's would have long moved north to breed and it's also possible that it was a Northern Hawk or Long Eared Owl as well.
Without having a photo, no definitive conclusion can be made but I can assure you it was not a Peregrine Falcon.