Unexplained bird deaths in BC

[Catherine]

A number of people were startled by birds suddenly falling out of the sky and plunging to the earth. They lay there dead and dying on the pavement with no apparent cause. The birds were all European Starlings and they are being studied no to see if they can determine the cause of death. In all 42 birds died.

https://nationalpost.com/news/dead-and-d...-community

This is shocking, but not unheard of, although this is a rather large number of deaths.  Occasionally a small number of birds will die. This was a massive event. I hope the cause can be determined. I can't even take a wild guess at the cause.  If I find anything out I will post it here.