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Animal species diversity was also impacted ; in one study a Harvard biologist found 24 species of birds and 5 species of mammals in a sprayed forest , while in two adjacent sections of unsprayed forest there were 145 and 170 species of birds and 30 and 55 species of mammals .
 Harvard
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Harvard