On April 26, 1986, an explosion at the\u00a0nuclear power plant in Ukraine<\/span>\u00a0sent radiation across Europe and forced the evacuation of entire towns, displacing tens of thousands. It was the worst nuclear disaster in history.<\/p>\n Four decades on, Chernobyl \u2014 which is transliterated as \u201cChornobyl\u201d in Ukraine \u2014 remains too dangerous for humans. But the wildlife has moved back in.<\/p>\n Wolves now prowl the vast no-man\u2019s-land spanning\u00a0Ukraine<\/span>\u00a0and Belarus, and brown bears have returned after more than a century. Populations of lynx, moose, red deer and even\u00a0free-roaming packs of dogs<\/span>\u00a0have rebounded.<\/p>\n Przewalski\u2019s horses, native to Mongolia<\/span>\u00a0and once on the brink of disappearing, were introduced here in 1998 as an experiment.<\/p>\n Known as \u201ctakhi\u201d in Mongolia (\u201cspirit\u201d), the horses are distinct from domestic breeds, with 33 pairs of chromosomes, compared with 32 in domesticated horses. The modern name comes from the Russian explorer who first formally identified them.<\/p>\n \u201cThe fact that Ukraine now has a free-ranging population is something of a small miracle,\u201d said Denys Vyshnevskyi, the zone\u2019s lead nature scientist.<\/p>\n