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Researcher Gabe Hamer, left, and veterinary science student Jessica... News PhotoGeographical Locations,Healthcare And Medicine,Horizontal,Human Gender,Illinois,Research,Science,Student,USA,Vet,WoodlandPhotographer Collection: Tribune News Service Researcher Gabe Hamer, left, and veterinary science student Jessica Girard try to determine the gender of a robin in a wooded area of Oak Lawn, Illinois, July 28, 2009. They are 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)