Update: this page is hard to read (grey print on white background), but it is really good as it lists many, many die-offs over the past decade. It is necessary to scroll right the way down the page:
https://fendaux.com/why-are-dead-birds-f...m-the-sky/
Note: there have been a very large number of die-offs this year; much more than before.
https://fendaux.com/why-are-dead-birds-f...m-the-sky/
Note: there have been a very large number of die-offs this year; much more than before.