Posted by Anonymous on Saturday, February 14, 2009 at 4:18pm.
Check this article.
http://www.stanford.edu/group/stanfordbirds/text/essays/MacArthur's_Warblers.html
The answer is at http://www.alex.k12.in.us/highschool/Teachers/Arodewal/FrontPage%20files/teachers%20pages_files/biology/1%20-%20Principles%20of%20Biology/Ecology%2037-47/39/activities/reading.pdf
Different species of warbler can occupy different niches of the same tree.
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