ROYAL TERN Thalasseus maximus A.
Vagrant; rare – from North America.
1 accepted record:
5 accepted British records: https://www.historicalrarebirds.info/u20/royal-tern
1). 2018, 10th December – 11th: Traeth Dulas – 3rd calendar year bird seen and photographed, then at Traeth Lligwy on 11th. (British Birds 112 p585).