The Wyoming Game and Fish Department will conduct a winter aerial survey for trumpeter swans and other waterfowl in the Pacific Flyway portion of western Wyoming next week. The annual aerial survey is coordinated with the U.S Fish and Wildlife Service to obtain a count of all trumpeters in the Rocky Mountain population in the western United States. The majority of these swans winter in the tri-state area of eastern Idaho, western Wyoming and southwestern Montana with small groups also found in Nevada and Oregon. Last winter, the survey tallied more than 6,100 trumpeters in the tri-state area which was a record high. Over 92 percent swans were migrants from interior Canada. In contrast, only 559 swans were counted this past fall in the year-round resident tri-state population, including a total of 207 birds in western Wyoming.