It contained a menagerie with wisents, deers, and chamois. Five wisents were introduced on 24 April 2011. In 2011 began the reintroduction of free-ranging wisents into the Rothaar Mountains. In Serpukhovsky District, there is the Prioksko-Terrasny Nature Reserve which contains protected wisents. Game was also a staple of noblemen&colon; wisents, aurochs, and deer were hunted. The wisents were brought to the park from the Prioksko-Terrasny Nature Reserve near Moscow. Wisents partly interbred with American bison were reintroduced several decades later.