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The film is an adaptation of Farley Mowat 's 1963 autobiography of the same name and stars Charles Martin Smith as a government biologist sent into the wilderness to study the caribou population , whose decline is believed to be caused by wolves , even though no one has seen a wolf kill a caribou .
 person: Farley Mowat; person: Charles Martin Smith
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 person: Farley Mowat; person: Charles Martin Smith