Celebrating my 200th ringed Black-headed Gull and 1600 sightings in Leiden


This first-winter Black-headed Gull with colour ring Yellow KHU6 that I observed in Leiden on 14 October 2016 is special for me for 2 reasons: It is the 200th ringed Black-headed Gull that I’ve observed here since I started ring reading in March 2009. It was ringed in Latvia and is my first colour ring …

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