Thanks for the info. I have now gone through the
video I took and found both birds in a similar light in a similar position (take
10 sec apart from the same position) and overlaid them onto the one photo. While
quality is poor, it shows the dark bird does have a white diagonal mark and
does appear to be smaller. (yes the light bird does have prey - a rabbit I
think but it is not clear from any of the photos taken on the
day).
Steve
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