Ever since 2012, 70 Sandwich terns have been seen on Texel which had been ringed in the south-west of the Netherlands. 16 birds had been ringed in the north-east of Scotland. Other terns (four individuals or less) came from Belgium, Griend island, Ameland island, Sweden, Portugal, Spain, Italy, or the Gambia.
In 2014, 88 young Sandwich terns were ringed at the nesting colony at Utopia nature reserve. Some have been seen again in England and France. Most one-year-old Sandwich terns spend their first summer in Africa, returning to Europe later. In 2015, more young Utopia terns were ringed.