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BBC Natural History Unit Boswall began as a radio producer , upon joining the BBC Natural History Unit in 1957 , producing series including Birds of the Air and The Naturalist .
 BBC, Boswall, BBC, Birds
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 BBC, Boswall, BBC, Birds