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STOPOVERS OF SWANS (CYGNUS CYGNUS AND C. BEWICKII) (ANATIDAE, AVES) IN THE AGRICULTURAL LANDSCAPE OF SOUTHERN KARELIA DURING THE SPRING MIGRATION

Spring migrations of the Whooper swan and Bewick's swan were studied on a farm-land near the town of Olonets during 1997 - 2017. Usually the majority of swans crossed the territory of the agricultural landscape in transit, and only a small portion of the birds stayed on it for feeding for 1 - 2 days. In 2017, swans formed a mass migration stopover on the fields, 340 to 1,328 individuals were counted on it for 11 days, whose majority (about 90%) were Bewick's swans.