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The International Union for Conservation of Nature has rated this fish as an endangered species because of its small extent of occurrence , the small number of locations in which it is found , and the extreme fluctuations in area of occupancy resulting from changes in the amount of available habitat .
 International Union for Conservation of Nature
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: media, plant, vehicle, astronomical object, time, disease, animal, location, person, organization, mythical figure, food, biology, geographical phenomenon, instrument, event 
Text: {0} 
Answer:
 International Union for Conservation of Nature