In what ocean is the island in which were found subfossil remains of the Henderson ground dove? 
Henderson ground dove: The Henderson ground dove ("Alopecoenas leonpascoi"), or Henderson Island ground dove, is an extinct species of bird in the family Columbidae. Pitcairn Islands: The Pitcairn Islands ( ; Pitkern: "Pitkern Ailen "), officially Pitcairn, Henderson, Ducie and Oeno Islands, are a group of four volcanic islands in the southern Pacific Ocean that form the last British Overseas Territory in the Pacific.
i don't know