I'm going to throw out another possibility. Bird Flu. I used to follow it in 2004. Occasionally would come across a story of birds dropping out of the sky. No explanation was ever given.

Lately Avian Flu has been in the news.

https://www.newsobserver.com/news/state/north-carolina/article258184823.html

https://www.livescience.com/h5n1-avian-flu-first-cases-us-farm-2021

I'm going to throw out another possibility. Bird Flu. I used to follow it in 2004. Occasionally would come across a story of birds dropping out of the sky. No explanation was ever given.

Lately Avian Flu has been in the news. Biggest outbreak since 2016.

https://www.livescience.com/h5n1-avian-flu-first-cases-us-farm-2021