What in the world???

[Warning: Alfred Hitchcock]

Apparently, the birds were yellow-headed blackbirds, a migratory species from Canada that winters in the area.

The birds — later identified as yellow-headed blackbirds — were discovered lifeless on sidewalks by residents of Cuauhtémoc City, the Spanish-language El Heraldo de Chihuahua reported.

People had some… thoughts on what caused the massacre. 😂

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In all seriousness, it was probably an example of murmuration – the swarming movement of a flock to avoid a predator:

Whatever in the heck happened, somewhere, Hitchcock is smiling.

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