Moving like a huge plume of black smoke, this enormous flock of hundreds of yellow-headed blackbirds was filmed hitting the ground in the Alvaro Obregon area of Cuauhtemoc, Mexico.
The incident, which took place last month, resulted in many of the birds being killed on impact, while others managed to stop just in the nick of time before hitting the ground themselves.
The researchers blamed increased urbanisation and noted that incidents like this will likely happen more often in the future as more natural land is replaced with streets and buildings.
"They're not looking very distant; they're actually following their closest neighbor in the flock so basically taking cues on where to move based on their closest neighbor," said ornithologist Scott V. Edwards who was involved in the study.
"Maybe the leader of the flock somehow didn't know they were close to the ground. If that's the case, then most of the birds in the flock wouldn't know they're close to the ground."
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