On Wednesday, March 19, the fifth and final volunteer action in Croatia was held at Kopački rit at the Kopačevo Visitors Center within the LIFE Danube Free Sky project. Students and teachers from the Faculty of Educational Sciences from Osijek participated in the workshop, during which we made nest boxes for the European roller (Coracias garrulus). European roller is one of the 12 target species in the project that once nested in Kopački rit, but due to the modernization of agricultural production, they no longer nest there.