When they spray the entire area(twice a year) from the planes at night to kill mosquitoes here in florida, you will notice the next day or so...dead birds under trees. I've seen it regularly myself. Not to mention how the landscapers put pesticides in the ponds around here to kill algae, etc, and you will read how most of the fish die and are found floating on top of the water (makes the papers once in a while) and how birds will drink the same water.
I know birds are killed/disturbed when things are built but we must built houses/hospitals/schools for humans.
You can’t really object to mosquito spraying because a few birds might be killed. Tell me you aren’t that nuts.
My neighborhood was built in a heavily wooded area 50+ years ago, I am sure some birds were killed/displaced then. Now the huge trees are full of birds and their nest so it worked out OK. I feed and water them and my yard is a riot of songbirds all year long. We still have a pair of Goldfinches that didn’t leave with the others. The male is bright yellow now.
If every egg laid by every bird hatched and lived to maturity and reproduced we would be knee deep in bird poop. Thankfully some of them die.