They grew up to 4m long and walked on all fours, although research suggests some could stand and move bipedally. These giant ground sloths, described in one paper as "a hamster the size of an elephant", were far removed from today's unhurried, tree-dwelling ones. He'd uncovered a megafauna paleoburrow, a prehistoric tunnel dug through rock by what Luiz Carlos Weinschutz, a geologist and one of the scientists who visited the farmer's property, concluded was the work of a giant ground sloth or giant armadillo from at least 10,000 years ago. The farmer had stumbled upon a puzzling subject in palaeontology that is still unfolding today. ![]() Deep claw marks embedded into the walls indicated its past occupant was not human. Hearing about this unusual find, researchers came to investigate and were surprised to find a tunnel nearly 2m high by almost 2m wide and about 15m long running across the field and right under the farmer's house. Much to the farmer's shock, the tractor had broken through what looked like top of an underground cavity. He jumped out and saw the wheel had sunk deep into the dry soil. ![]() In 2009, a farmer was driving through his corn field in the south of Brazil when he suddenly felt his tractor sink and lurch to one side, making the vehicle shudder to a halt.
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