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The domestic pigeon has been used both for food and as a means of communication between far-flung places through the exploitation of the pigeon 's homing instinct ; research suggests it was domesticated as early as 10,000 years ago .
 domestic 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:
 domestic pigeon