On New Year’s Day in 2025, more than 1,000 birds were found dead near a hiking trail in Bulgaria, just over a kilometre from a site where fireworks had been set off, after panicked birds flew into trees and each other.

Last year on New Year's Eve, I walked to the shops in the morning and heard some newly hatched chicks up in a tree, aggressively chirping to be fed by momma bird.
In the evening, the neighbor on the other side of the street set off one of those firework batteries which only go, well, about as high as a tree.

So, basically those chicks either had a heart attack or are traumatized for life.