Here’s a good, recent summary of the recent bird and fish deaths that have been going on.
These mass deaths seem to be from different reasons in different places (overeating, cold, fireworks, etc.).
But what we need to know is: is there a trend, or is this more or less what “normally” occurs, but now we can track it better with the all-eyes-everywhere technology we have. If there’s a real increase in these deaths, we sure need to understand more.