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Skipping swans: Fuelling rates and wind conditions determine differential use of migratory stopover sites of Bewick's Swans Cygnus bewickiiMigrating swans profit from favourable changes in wind conditions at low altitudeLonger guts and higher food quality increase energy intake in migratory swansInternational Single Species Action Plan for the Conservation of the Northwest European Population of the Bewick’s SwanWaterplanten en Kleine Zwanen Cygnus columbianus bewickii: een wederzijdse afhankelijkheid?Cygnus columbianus Bewick's Swan and Whistling Swan