Why Did 60,000 Antelope Drop Dead Over Four Days?

When 60,000 critically endangered saiga antelope dropped dead in central Kazakhstan in June, it had to have been a major bummer for the veterinarians who had just arrived to study the herd. Those wildlife vets have since become detectives, trying to unravel an Agatha Christie-worthy puzzle. Now they think they have a culprit, but it's a baffling one.