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Since no definitive proof of the thylacine 's existence in the wild had been obtained for more than 50 years , it met that official criterion and was declared extinct by the International Union for Conservation of Nature in 1982 and by the Tasmanian government in 1986 .
 International Union for Conservation of Nature
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 International Union for Conservation of Nature