See the ringing info on this bird in the comments:
http://www.birdguides.com/picture?f=294711This bird is ringed in the ground-breeding colony of Enkhuizen, in the IJsselmeer area (as a nestling in 2010). We have several large colonies in this area (thousands of nests). We didn’t have any other observations of this bird so far.
Many thanks for sending me this!
Best wishes, Stef van Rijn
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Andrew Chick Website:
http://www.forktail.co.uk/