An immature Glaucous-winged Gull on the water, laying down and flapping its wings

Flapping gull

I think it’s an immature Glaucous-winged Gull.

   21 August 2023
   ILCE-7RM5
   1/1600s    f/5.6   271mm   ISO 400
An immature Glaucous-winged Gull on the water, laying down and flapping its wings