2016 with a small herd. In 2020 a new herd of 14 bison was established in the Slikken van de Heen. Numbers at the end of 2017 were: Lelystad 24, Kraansvlak 22, Maashorst 15 and the Veluwe 5, for a total of 66 animals. : By the end of 2019 the number was 2,269, of which 2,048 were free-roaming and 221 were living in captivity, including zoos. A total of 770 belonged to the wild population in the Białowieża Forest and 668 to Bieszczady National Park. The total population has been increasing by around 15% to 18% yearly. Between 1995 and 2017 the number of bison in Poland doubled; from 2012 to 2017 it rose by 30%. Poland has been described as the world's breeding centre of the European bison. Zubr from Poland have also been transported beyond the country's borders to boost the local populations of other countries – among them Bulgaria, Czechia, Denmark, Moldova, Romania, Spain, Switzerland, and others. As the number of animals is growing, more bison are spotted in areas where they have not been seen in centuries, especially migrating males in Spring. The placement of about 40 free-roaming bison in the Lasy Janowskie in 2020/2021 resulted in ecologists' efforts to redesign some bridges of the S19 highway (constructed in 2020-2022) to allow large animals to cross it. : The wisents were reintroduced in 1958, when the first two animals were brought from Poland and kept in a reserve in Hațeg. Similar locations later appeared in Vama Buzăului (Valea Zimbrilor Nature Reserve) and Bucșani, Dâmbovița. The idea of free bison, on the Romanian territory, was born in 1999, through a program supported by the World Bank and the European Union. Almost 100 free-roaming animals, as of 2019, population slowly increasing in the three areas where wild bison can be found: Northern Romania – Vânători-Neamț Natural Park, and South-West Romania – Țarcu Mountains and Poiana Ruscă Mountains, as part of the Life-Bison project initiated by WWF Romania and Rewilding Europe, with co-funding from the EU through its LIFE Programme. : As of 2020, the population of Wisents in Russia has greatly recovered and stands at 1,588 individuals. : In March 2022, 5 animals (one bull and four cows) were reintroduced where bison went extinct c.1800. Animals were transported from the Białowieża Forest and reintroduced on the Fruška Gora mountain. : A bison reserve was established in Topoľčianky