This video shows Sandwich terns, during their mating season, 5 May 2014, near Dishoek in Zeeland province in the Netherlands.
In June 2015, over 300 Sandwich tern chicks on Texel island in the Netherlands were provided with colour rings.
People with telescopes can read those rings, making it possible to map the journeys of these young birds.
A few of the ringed Texel Sandwich terns have already been reported from west Africa.
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