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The term " vulture fund " is a metaphor which is used to compare these particular hedge funds to the behaviour of vulture birds “ preying ” on debtors in financial distress by purchasing the now-cheap credit on a secondary market to make a large monetary gain , in many cases leaving the debtor in a worse state .
 vulture
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:
 vulture