Black Falcon question

["Greg & Val Clancy" <>]

Hi Tony,

Black Falcons glide on flat wings, Brown usually upswept, sometimes 
appearing somewhat flat.   Black's tail is longer giving different overall 
shape in flight.  Completely dark underwing in Black, paler flight feathers 
in Brown. Blacks hunt birds on the wing (like a Peregrine), Bowns usually 
hunt ground prey by either hovering or launching attack from a perch (like a 
Kestrel).
When perched Black's head more rounded, Brown's flatter on top, long tail on 
Black.
Greg Clancy