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Most abundant are the macaroni penguin , of which some 2 " million pairs breed on the islands , and the king penguin , home to 700,000 breeding pairs ; half the world 's population .
 macaroni penguin, king penguin
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:
 macaroni penguin, king penguin