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Chroicocephalus ridibundus
Welcome to Project Noah Marko.
A couple of small points, the name you have quoted is the old scientific name so should go in the scientific name field but recently the scientific names for Gulls was updated and this one is now Chroicocephalus ridibundus.
The Slovenian common name is "Rečni Galeb", or in English Black-headed Gull.