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As part of a state wide bird census organized by the Illinois Audubon Society, a Spring Bird Count has been held in DuPage County from . The count is performed by groups of volunteer birdwatchers who spend the day counting all the birds they can find in DuPage County. The exact date of the count varies but is always on the Saturday that falls between May 4 and May 10. These pages summarize the results from DuPage County only even though the Fermilab site straddles the border between DuPage and Kane counties.