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The male , at , is smaller than female , at an average of 58 kg ( 128 lb ) , making it the worlds third heaviest living bird species after the Ostrich and the similarly-sized Southern Cassowary .
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Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
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