Scientists are rethinking when humans first arrived in the Americas. New evidence suggests people were here much earlier than previously thought. They might have lived alongside giant sloths and mastodons for thousands of years without causing their extinction.

In Brazil, fossils show signs of being crafted into jewelry by early humans around 27, 000 years ago. This challenges the old belief that humans quickly hunted these giant animals to extinction.

Researchers are studying sites across the Americas to understand this early human presence better. They're looking at bone modifications, fossilization processes, and even the temperature of ancient fires.

One site, Monte Verde in Chile, has tools and plant remains dating back 14, 500 years. Another site in Uruguay has bone cut marks from around 30, 000 years ago.

In New Mexico, human footprints from 21, 000 to 23, 000 years ago were found with tracks of giant mammals. This raises questions about why no stone tools were left behind.

The exact arrival time of humans in the Americas is still debated. But it's clear that if humans did arrive earlier, they didn't immediately wipe out the giant animals.

Humans and Giant Animals: A Longer Coexistence

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