The Department of Health is testing dead robins, jays, crows, ravens, and raptors for West Nile virus. ???Culex mosquitos prefer to feed on birds rather than people or other mammals, and although we have not had a positive human case of West Nile virus for the past four years, it is important that we notify Vermonters when we identify the first positive sample,??? said Patsy Kelso, an epidemiologi