Public participation is a key element in nature conservation in Europe and a necessity for collecting broad scale data on biodiversity and its dynamics. However, vast societal differences exist between eastern and western European countries, resulting in problems for public participation in post-communist states as compared to western countries. Here, we compare diversity in monitoring practices and public participation in countries with different political histories. Drawing on in-depth ethnographic studies conducted in Lithuania and Poland, as well as a rapid assessment in Denmark, we have focused on the historical, cultural and social determinants of the volunteers' participation in biodiversity monitoring. Our results indicate the reasons why volunteer involvement-as an expression of a participatory approach-has a lower incidence in the post-communist countries, compared to voluntarism common in occidental democracies. We discuss our results in the context of the main social factors considered to be a legacy of the Soviet regime.