 In Chernobyl, the population reached 65 individuals in 2003, but poachers might have decreased their number to an estimated 30–40 individuals by 2011.As of 2019 the estimated population in the Chernobyl zone is over 100 individuals.An intensely researched population of free-ranging animals was also introduced to the Hortobágy National Park" puszta" in Hungary; data on social structure, behavior, and diseases gathered from these animals are used to improve the Mongolian conservation effort.