Hundreds of birds die mysteriously in mid-flight hitting the ground in CuauhtĂ©moc, Chihuahua, Mexico. 
   
Another similar incident happened in Pembrokeshire Wales. Around 200 dead or dying starlings fall from the sky and rain down on cars. 
People heard a big flash and loud boom directly after the flash/boom the birds starting falling to the ground. 
And a similar incident happened in Downtown St. Louis where dozens of crows found dead. 
This has been happening for a several of years now and no one has an explanation why birds just drop dead from the sky.