The color tone of the primaries seems on the pale side - almost
or actually within the range for kumlieni? Also the extent
and thickness of the primary fringes seems exceptional for thayeri;
isn't the slight "pinch" into the dark at the tip a
The uppermost tertial seems to fit kumlieni while the
other tertials seem more like a well-marked thayeri. There
are published pics of kumlieni (by Bruce Mctavish in Birding
World 1996, 1997) with less-barred tertials than this bird.
The scapulars are very interesting: there are only two or
three thayeri-like juv scaps (dark-centered), with the
rest looking good for juv/B1 kumlieni or B1 thayeri:-
I think that most (what %age?) thayeri retain their dark-centered
juv upper scaps well into late February.
P1 -P3 (perhaps P4) seem to completely lack a dark subterminal
mark - isn't this unexpected in thayeri?
The tail has a thick white tip, and R1 (outermost retrix) is
fully barred, R2 mostly barred, R4 more barred than R3, and faint
barring at base of R5.