What Is Killing Off Kazakhstan's Rare Antelope?

A dead saiga mother and her calf in the Qostanai region of Kazakhstan on May 20, 2015

A saiga mother and her calf graze next to the carcasses of hundreds of dead antelopes in the northern Qostanai region of Kazazkhstan on May 20, 2015.

A tractor transports the carcasses of dead saiga in a field in the Qostanai region of northern Kazakhstan on May 20, 2015.

Men load a trailer with the carcasses of dead saiga during a previous die-off in May 2010 in a field some 600 kilometers southwest of Uralsk, Kazakhstan.

Men load a trailer with the carcasses of dead saiga in May 2010.

Saiga outside Almaty, Kazakhstan, in 2010