Voy a poner unas fotos que me ha pedido Martin Reid de Larus michahellis de 1º invierno.
Hello Martin, these pics are for you. All of them are 1w birds from N and NW Spain:
And the last one of two 1w Larus michahellis. Ringed Bird is obviously bigger than the smaller to the left.
Ringed gull is from Tarragona (Mediterranean Spain); some mediterranean birds (males??) are bulky and very big ones (like small marinus). Our birds are small, dark, and its moult is slower than mediterranean birds.