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In some areas , a lack of knowledge means the true status of a species is unknown ; the Negros fruit dove has not been seen since 1953 , and may or may not be extinct , and the Polynesian ground dove is classified as critically endangered , as whether it survives or not on remote islands in the far west of the Pacific Ocean is unknown .
 Negros, Polynesian, Pacific Ocean
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Negros, Polynesian, Pacific Ocean