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Phenology Behind Plants

3,000 observers including many notable naturalists participated in the North American Bird Phenology Program at USGS Patuxent Wildlife Research Center (PWRC) started by Wells Cooke, “father of cooperative study of bird migration in America” which is in possession of a collection of millions of bird arrival and departure date records for over 870 species across North America, dating between 1880 and 1970.


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