Originally Posted by andyb39
I believe it's a 2nd-year Christmas Island - buff head, lack of a breastband and lack of axiliary spurs makes it 2nd year, plus the diagnostic black breast "tabs" and heart-shaped belly patch make it CI. See plate 20 and the table on p.37 here:
I read the paper you link to before I posted and came to much the same conclusion. I had a hard time matching this bird to either Great or Lesser Frigatebird, but could see no difference between it and e.g. the one here: http://orientalbirdimages.org/search..._ID=&Location=
I am, however, wary about what variation might exist between these three, not least as CIF would be the first national record.