Today was the first time this year that I made my regular round of checking various locations in my home town for the presence of ringed gulls. I do this at least twice a week during the winter season to try and locate any wintering and visiting gulls.
This resulted in a rare observation for Leiden and myself in the form of an adult Black-headed Gull Chroicocephalus ridibundus fitted with a ring from Slovakia (a distance of about 1000km from here). Observations of such rings are not uncommon in The Netherlands but they are primarily made in the southern parts of the country.
It is also my first ever observation of a ring from this country.
Here is a map showing the location in Leiden where I saw it:
I place this observation in the top 3 of my list of rare observations of Black-headed Gulls in Leiden. It is in good company of a Spanish-ringed individual and one fitted with a Russian ring. Let’s hope there is more to come this winter!