Italian Diego Fenicchia was driving in the capital Rome early Friday when he saw dead birds on the streets.
"Guys, this is the filth of humans, the fireworks, hundreds of dead birds, hundreds," Fenicchia said as he filmed the images near a metro station in Via Cavour and uploaded on his social media account.
"Hundreds of dead birds on Via Cavour. It's embarrassing, it's sad, incredible, incredible, my happiness has already gone away."
It is unclear exactly how the birds died, but in a post on its Facebook page the International Animal Protection Organization (OIPA) attributed it to fireworks. Sky News reported they were mostly starlings.
"It can be that they died from fear," said OIPA spokesperson Loredana Diglio.
"They can fly up together and knock against each other, or hit windows or electric power lines. Let's not forget they can also die of heart attacks."
The Mayor of Rome had prohibited fireworks from December 31 to January 6. But thousands were still set off on New Year's Eve.
Like animal rights groups here in New Zealand, the IAPO has called for a ban on fireworks for personal use.
Reuters / Newshub.