Birds keep dropping dead from the sky

Hundreds of birds mysteriously die in flight, an example of this
is the incident in Cuauhtemoca, Chihuahua, Mexico
(https://youtu.be/-eb9jg6pRUE). Another similar incident took
place in Pembrokeshire, Wales. About 200 dead
(https://bit.ly/36xQgcm) or dying starlings fall from the sky onto
cars.