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Wood duck

Fixed-wing aircraft were used in the aerial counts and were flown along the transects at a height of 30-46 m (100-150 feet) above ground and at a ground speed not exceeding 169 km/hr (105 miles/hr). Dates of the survey, in May, were standardized to conform to geographical differences in phonological events. Time of the survey and flight conditions were also prescribed. The aircraft pilot and another observer recorded all identifiable ducks within transect boundaries (200 m = 0.125 mile on either side of the flight line). Unidentified ducks were not recorded.