Next, compare the upper-primaries: On the Corpus bird the black
on P6 (and slightly on P5) is more extensive on the outer web
than on normal heuglini:
- but on this crop of a Bahrain heuglini that I suspect
to be a BPH, it too has the black on the outer web of P6 longer
than on normal heuglini:
Now lets compare tails:
-All the above tails are from Bahrain or Oman heuglinis
(some may be BPHs) except for the smallest image (right, near
the top), which is the Corpus bird. The tail position relative
to P6 varies from just longer to just shorter and the Corpus bird
fits neatly into this range, I feel.
Lastly, look at the head/bill shapes: images C and E are the
Corpus bird; B is from Oman (presumed BPH; photo by Arrend Wassink);
A,D,F are from Bahrain (and F may also be a BPH - note the still-growing
P10 with large mirror):-
A
B
C
D
E
F