- The very dusky head, breast and undersides, with a contrasting pale nape and slightly paler upper breast/throat.
- Very similar looking covert markings, particularly on the median coverts.
- Similar size - just larger than a Herring Gull.
- The bill, which is not particularly big and has an identical looking black tip mark.
Hedgerley Landfill, December 2015: Birdguides
Knowl Hill tip, Berks, January 2016: Berksbirds
Little Marlow GP, February 2016: Bucksbirds
Not a particularly good record shot at Sonning Eye, Oxon in January 2016, though it does show the dusk head markings: Oxonbirds
The roost also had a third winter Yellow-legged Gull and a full summer Med Gull. The Med Gull came in late onto the water and then flew into the throng of Common Gulls and disappeared before I could get a shot of it - lovely looking bird though.