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  It may not really involve prey in either case. Visually a flying approach on a course set to avoid the fence the snow-capped roof would blend entirely with the distant background. Echo location would be a nightmare also;soft snow and the angle of the roof would make the hazard invisible.
  Had an ordinary song bird been involved we might expect it to have wandered around until it got it's bearings. Something with more mass than that sparrow had the lucky escape.

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