information:extraction, structural:reformatting, structural:scholar_edition
1950s onwards

The first two bison were released into the wild in the Białowieża Forest in 1929. By 1964 more than 100 existed. Over the following decades, thanks to Polish and international efforts, the Białowieża Forest regained its position as the location with the world's largest population of European bison, including those in the wild. In 2005–2007, a wild bison nicknamed Pubal became renowned in southeast Poland due to his friendly interactions with humans and unwillingness to reintegrate into the wild. As of 2014 there were 1,434 wisents in Poland, out of which 1,212 were in free-range herds and 522 belonged to the wild population in the Białowieża Forest. Compared to 2013, the total population in 2014 increased by 4.1%, while the free-ranging population increased by 6.5%. Bison from Poland have also been transported beyond the country's borders to boost the local populations of other countries, among them Bulgaria, Spain, Romania, Czechia and others. Poland has been described as the world's breeding centre of the European bison, where the bison population doubled between 1995 and 2017, reaching 2,269 by the end of 2019 – the total population has been increasing by around 15% to 18% yearly. In July 2022 a small population was released into woodland by Canterbury in Kent to trial their reintroduction into the UK. In May 2024, a small population was released in central Portugal.