Isn't the pattern of white on the belly more indicative of Christmas Island Frigatebird? (White spurs extending from mid-way along the white area towards the mid-point of the wing, white not extending fully into the wing, white extending broadly as far back as the legs). The late autumn date I think is also more typical of CIF records in Hong Kong
[ Last edited by ajohn at 10/11/2009 14:17 ]