Why 200,000 Antelope Dropped Dead in 3 Weeks

That is my concern, though as a natural phenomena, the only likely candidate would be mass CO2 release, and that could potentially cause greater and more globally affecting consequences. The only natural action releasing that kind of CO2 would be seismic, magmatic though if that were the case a simple fly over should be able to determine this as the vegetation would suffer the same fate as the alpaca

200,000 drop dead in two weeks, (we should assist in the effort to move the remaining beasts) see if we can figure out what is really going on in that desert.

I evaluated that option, deadly yes but in a much less dramatic drop Out.