A pair of Bewick's swans (IMAGE)

Netherlands Institute of Ecology (NIOO-KNAW)

A pair of Bewick's swans

Caption

The research was only possible because of the code some swans carry. Sightings of these tagged animals - often by citizen scientists - offer insight into the whereabouts of individual swans and changes therein. In winter, the swans favour areas with an air temperature of 5.5 °C.

Credit

Bart Nolet/NIOO-KNAW

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