BONAPARTE’S GULL Chroicocephalus philadelphia A.
Vagrant; rare - from North America.
4 accepted records - of which one has been presumed to have returned for 3 years:
4). 2016, 13th April: Cemlyn – 2nd calendar year seen and photographed. (British Birds 110 p587-588).
3c). 2011, 12th February – Traeth y Ora – adult in the bay between Traeth Dulas and Traeth Lligwy. Present in the area until the 27th March. Presumed to be a returning bird. (British Birds 105 p588).
3b). 2010, 14th January – 2nd March: Traeth Lligwy – adult, presumed to be returning bird from 2009. (British Birds 104 p586).
3a). 2009, 27th September: Traeth Dulas – 1st winter seen. (British Birds 103 p595-596).
1 & 2). 1998, 16th May – 17th: Penrhos Coastal Park and Beddmanarch Bay – 2 1st winters, 1 remaining to the 17th. (British Birds 92 p 580).