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Threatened bird species living there are for example the imperial eagle , the lesser kestrel , the great bustard , the pale-back pigeon and the white-throated bushchat .
 great bustard, pale-back pigeon
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:
 great bustard, pale-back pigeon