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Bethany Krebs, a PhD candidate in ecology, is face to face with a... News PhotoCandidate,Environment,Freedom,Geographical Locations,Healthcare And Medicine,Horizontal,Illinois,USA,WoodlandPhotographer Collection: Tribune News Service Bethany Krebs, a PhD candidate in ecology, is face to face with a miffed robin after she freed it from a net in a wooded area of Oak Lawn, Illinois, July 28, 2009. Krebs is part of a research team trapping mosquitoes, catching birds and testing their blood trying to find out why West Nile virus and other mosquito-borne diseases are prevalent in the suburbs south of Chicago. (Photo by David Pierini/Chicago Tribune/MCT via Getty Images)