This Massive Tunnel in South America Was Dug by Ancient Mega-Sloths

Researchers have found several colossal burrows in South America that are so huge and neatly constructed, you’d be forgiven for thinking humans dug them as a passageway through the forest. Turns out, they’re far more ancient than they look, estimated to be at least 8,000 to 10,000 years old, and no known geologic process can […]

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