I'll see if I can find the article but a couple of years ago there was another mass die off of a type of deer that has an enlarged nose. It appears the the aver

I'll see if I can find the article but a couple of years ago there was another mass die off of a type of deer that has an enlarged nose. It appears the the average temperature had risen just enough to allow a common bacteria they had in the nasal passage to replicate at speed and poison them. It wasn't just the temperature, but the humidity (or lack of) that also led to this, I'll see if I can find the article. https://phys.org/news/2015-05-mass-deaths-rare-kazakhstan-antelopes.html https://phys.org/news/2015-05-mass-deaths-rare-kazakhstan-an... edit here was the detail. It appears it was the rain that caused the issue and a third of the total population died.