Massive underground tunnels discovered across South America are not human-made. Scientists now believe extinct giant ground sloths dug these extensive structures. These palaeoburrows, found in Brazil, ...
Massive tunnels have been discovered in South America, but what animal made them? Learn about the tunnels created by ...
Morning Overview on MSN
Giant tunnels in South America exist, and humans didn’t build them
Deep beneath the hillsides and suburbs of Brazil, there are tunnels so vast and regular that they look like abandoned subway ...
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