Conservationists have solved a mystery that has bedeviled them for serveral years: what caused the mass die-off of hundreds of thousands of critically endangered saiga antelope in Central Asia.

About 60 per cent of the rare antelope species was destroyed when 220,000 of them died from blood poisoning in Kazakhstan in 2015. (Joel Berger/Wildlife Conservation Society via Associated Press ...

Brights Zoo in Limestone, Tennessee is mourning the loss of one of their own, a 7-year-old rare African antelope named Lief ... for too long, and he died shortly after the procedure." ...