Yesterday I visited the gull colony of IJmuiden (Forteiland), the Netherlands, to assist with ringing adult gulls (more on that in a later post).
The colony is home to about 1100 breeding pair of Lesser Black-backed Gull Larus fuscus graellsii (Dutch intergrade) and about 130 breeding pair European Herring Gull Larus argentatus argenteus.
As you can see from the photos, the colony is located on an island which used to house a fort as part of the defence line of Amsterdam, constructed around 1900.
Below a selection of photos of some of the ringed individuals that I encountered.
Note that some of the Herring Gulls have already started dropping inner primaries P1/P2; much earlier than the Lesser Black-backed Gulls start with their primary moult.
All photos were taken on 19 May 2014.
European Herring Gulls
Bird #1 – Green Y.AAF
One of the first gulls to be ringed in 2008 in the colony (as an adult). Note the shape of the tongue on P9.
Bird #2 – Green Y.BKD
Ringed in 2013 in the colony as an adult.
Bird #3 Green Y.ALK
Ringed in the colony in 2009 as an adult.
Lesser Black-backed Gulls
Bird #4 Green Y.ANC
Ringed as a pullus in the colony in 2009. With other ringed adults in the background.
Bird #5 Green Y.AWL
Ringed as a pullus in the colony in 2011 and looking very adult like for a 4th-calendar year. Performing a long-call at his favorite post in the colony.
Bird #6 Green Y.BCA
Bird #7 Green Y.BCW
Bird #8 Green Y.BKR
Ringed as an adult in the colony in 2013.
Bird #9 Green Y.AWH
3rd/4th-calendar year type. Note the brown tertials and the lack of white tips to the primaries.
Bird #10 Red RWN
10th-calendar year individual, ringed as a nestling in the United Kingdom in 2005, now breeding in the Netherlands.
Bird #11 White N0LV
With Spanish ring.
Bird #12 White N07R
Ringed in Spain as an adult in December 2012.