Saiga antelopes have experienced catastrophic mass mortality events killing hundreds of thousands in days, driven by a combination of climate conditions and bacterial disease in already stressed populations.
Mass mortality events in saigas cause acute suffering at extraordinary scale - hundreds of thousands of animals dying from overwhelming septicemia within days. The calves born just before the 2015 event died alongside their mothers before they could nurse. The populations that survived had recovered from previous conservation crises, demonstrating resilience, but climate-driven increases in mortality event frequency may overwhelm this resilience. Individual welfare and population viability are intertwined: preventing the climate conditions that trigger bacterial outbreaks is both a welfare and conservation imperative.