I think the problem is worst in the south of England with insect
populations in general. This has a knock on effect on bird populations
as insects are the main source of food for nesting birds. Bird
populations further north and west are holding up much better and are
increasing in some species.

To keep things on topic some bird species are declining due to climate
change, Willow Tit is a good example.

Alan

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Lots of bird species are declining and it is pretty obvious it is things
linked to climate change and pesticides.
We go for a drive in an August evening and get home and not a dead moth
or insect to be seen on the windscreen. Used to have to spend ages
removing them before going out the next day.
Dave
(I have wondered if a more aerodynamic windscreen design is a factor as
well though?)