A video of a flock of birds crashing into the ground in Mexico, a phenomenon that shook the internet last week, is a naturally occurring instinct in the species, experts say.Dozens of dead birds were discovered in the northern Mexican state of Chihuahua on Feb. 7, and a security camera recorded the incident.An ecologist said the incident was likely caused by a predator and the birds’ instinctive defensive response, known as a murmuration, the Guardian reported.
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