The mourning dove call count survey (CCS) was initiated in 1966. State and federal biologists from all ten Central Flyway states conducted surveys in the morning between 20 May and 5 June counting doves on 200 fixed routes in the Central Flyway. Each route was 20 miles long and observers stopped at one-mile intervals where they counted doves seen and heard. This data was combined by the USFWS to provide an annual index to population size for the Unit. Each year, a Mourning Dove Status Report was produced that compared the current data with that from historical counts. More information is available on this web site.