In Poland, active protection of the fat dormouse started relatively late. The pilot reintroduction programme was initially undertaken in the Sieraków Landscape Park in 1997 and was successful. The population has adapted to the settled area and is now stable. In 2003, the next stage of fat dormouse reintroduction in Poland began. The Szczecin National Park was chosen for this purpose. Fat dormice settled in the Puszcza Bukowa Wilderness in the Trawiasta Buczyna reserve, and then in 2004 in the Kolowskie Parowy reserve. In 2005, no reproduction was observed as it was not a beech mast seeding year, but in 2006 a juvenile individual was spotted. In 2011, the next stage of reintroduction began, this time in western Poland. Ultimatelly, the Barlinek-Gorzów Landscape Park was chosen. The process of active protection of the fat dormouse is supported by educating the local community, enriching the nutritional offer, and increasing the number of nesting boxes for the rodent.