Gobsmacking scale of the die -off, if it is a natural phenomenon , not much can be done I suppose, I wonder how genetically diverse saiga are, whether that's a factor . Although I do think gathering them up into a pit pretty questionable surely better to rot down where they lie and have all that nutrients retuned to the grasslands. I wonder if the populations remaining will have greater recruitment levels if they can access all this extra grazing? Bound to be heartbreaking for the scientists studying them though.