Mysterious wave of antelope deaths

Around half of the world's critically endangered Saiga antelope have died suddenly in Kazakhstan since 10 May 2015. The animals die within hours of showing symptoms, which include depression, diarrhoea and frothing at the mouth.

Herd fatality is 100% once infected, with an estimated 40% of the species' total population already dead. More than 120,000 carcasses had been found as of late May, while the estimated total population was only 250,000.

(Washington Post, BBC, Reuters)