 The world's largest captive-breeding program for Przewalski's horses is at the Askania Nova preserve in Ukraine.Thirty one horses were also released in the area evacuated after the Chernobyl accident, which now serves as a deserted "de facto" nature reserve.In Chernobyl, the population reached 65 individuals in 2003, but poachers might have decreased their number to an estimated 30–40 individuals by 2011.