Tepuye de Cerro Azul, the largest of the rocky, image-covered shelters studied by a team of researchers, in the Serranía La Lindosa region of Colombia. Jeison Lenis Chaparro-Cárdenas

Researchers discovered thousands of drawings adorning three rock shelters in the Colombian Amazon.

The drawings cover more than 2.5 miles of rock and are at least 11,800 years old.

They depict an ancient hunter-gatherer society that lived at the end of the Ice Age, with scenes of humans hunting mastodons and images of other extinct animals like Ice Age horses.

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More than 12,000 years ago, near the end of the Ice Age, humans hunted mastodons: ancient mammals that resembled

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