[SolaceQuantum]

"I wonder if there's a similar decline in other animals that rely on insects, eg bats"

Bats have had a massive population dip in several areas in the americas, up to and including to the point where places bats hibernate to have been forbidden in an effort to stop the spread of a fungus ('White Nose Syndrome') that causes the bat to wake during hibernation, speeding its metabolism and causing it to starve itself. Several species have gone from common to endangered/critically endangered because of this. There's ongoing research as to how bats became more vulnerable to this existant disease- is it higher temps? Toxins?