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A Christmas Island frigatebird (Fregata Andrewsi) flies at Tanjung Pasir beach in Banten, Indonesia, on June 2, 2018. Christmas Island frigatebird is one of the world's most threatened seabirds.(Xinhua/Dedi Istanto)

A Christmas Island frigatebird (Fregata Andrewsi) flies at Tanjung Pasir beach in Banten, Indonesia, on June 2, 2018. Christmas Island frigatebird is one of the world's most threatened seabirds.(Xinhua/Dedi Istanto)