Black Falcon question

[Tony Eales <>]

I've been looking at pictures and reading up but I would like some advice from 
the collective experience of the list. Can anyone tell me some good field marks 
or behaviour/habitat/jizz type advice to help distinguish a Black Falcon from 
dark morphs of Brown Falcons. I see a lot of Brown Falcons of all morphs in my 
work but every so often I think "is that a Black Falcon" but as I'm working I 
can't spend a lot of time observing. Some key features would help a lot.

Cheers Tony
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