Probably wishful thinking. 
On my porch west of Berthoud, last week 3 individuals riding thermals and 
moving south. 
Only reason I noticed was they were all white under and the wings seemed a 
different shape and wing angle than the usual red tailed, and no red. Then I 
thought I heard a call that was more like a whistle. By the time I grabbed my 
bins I only got a few seconds before they moved out of view. Of course once I 
looked them up in a guide I realized I should have looked for the black band on 
the tail. Maybe I would have noticed if it was there without looking for it or 
it was a juv?

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