Lesser Black-backed Gull S 13-14CY, April 29 2014 & April 17 2015, Katwijk, the Netherlands.
Ringed as pullus white E or yellow E (that ring is lost) and red S, ringed in July 2002 at Maasvlakte, Zuid-Holland, the Netherlands.
below: Lesser Black-backed Gull S 13CY, April 29 2014, Katwijk, the Netherlands.
below: Lesser Black-backed Gull S 14CY, April 17 2015, Katwijk, the Netherlands.
Still with black on both mandibles.
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