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Established by the leading naturalist and author Mark Cocker in collaboration with the eminent wildlife photographer David Tipling and the Natural history specialist , Jonathan Elphick , the Birds and People project is a new experiment in natural history and cultural anthropology . "
 Mark Cocker, David Tipling, Jonathan Elphick
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Mark Cocker, David Tipling, Jonathan Elphick