Kumliens Gull
Kumlien’s Gull Larus kumlieni in the Dutch Rhine- Meuse delta
Two individuals were present in Westkapelle in the Dutch Rhine- Meuse delta on 16th December 1993; the first record for The Netherlands. See here:
On 30th December 2020 this individual was found resting among Dutch Herring Gulls Larus a.argenteus on the Brouwersdam.