Why Are The Saiga Dropping Dead?

It's a desperate image - a central Asian steppe with scattered bodies of small animals. These are the saiga antelope, a highly endangered breed - one of the few animals that made it through the Ice Age with us, and now limited to central Asia, mainly in Kazakhstan. Now, over just a few weeks, more than a hundred thousand of them have died - that's around half the existing population - and no-on knows why. Roger Hearing has been speaking to EJ Milner-Gulland of the Saiga Conservation Alliance