after the mass die-off last year, the saiga antelope population was left decimated. here alone, in the largest saiga population, more than 200,000 animals died. 90% were wiped out in a matter of days. stefeffen: i was s shocked. i was in the field myselelf and sasaw with my own n eyes the f t dead saigagas lying there. it was the first place whehere t happpped, and i i was right the. in: 5000 animals a b buried under this hill. itit's the first time steffen zuther and the british antelope specialist richard kock have returned since the great die-off. they want to find out why so the pasteurella bactcterium, whh led to t t deaths,as been identified. the researchers also know that before the die-off there was a huge drop in temperature. richard: and the animals were very stressed. they lost their coat. they don't have their winter coat, so the stress, in combination with exposure to bacteria or the presence of bacteria, leads to the invasion of the bacteria into the body and rapid death. peracucute, five hours, 12 hour, dead. ingaga: there have oftenen beens deaths amon

but first we go to kazakhstan, home to the saiga antelopes.cies was nearly wiped out. we went to find out why. it's been a year since news

but first we go to kazakhstan, home to the saiga antelopes. species was nearly wiped out. we went to find out why. it's been a year since news

but first we go to kazakhstan, home to the saiga antelopes.tly, the species was nearly wiped out.