HFCheung

This is definitely a White-Tailed Tropicbird.  Please wait a while for me to  tell you the evidence.  Thanks for the photo.

HF Cheung

HFCheung

One can refer to the Bird of the Indian Subcontinent, by Richard Grimmett, Coral Inskipp and Tim Inskipp. White-tailed Tropicbird has smaller bill compared to the other two Tropicbird species. A juvenile White-tailed Tropicbird has pale yellow bill. It has several black primaries at the wing tip. In comparision, Red-billed Tropicbird has much more black primaries at the wing tip, while Red-tailed has grey or black bill and no black primaries.

HF Cheung