Usually, tunnels are made either by human engineers or flowing water. But near the town of Novo Hamburgo, Brazil, there are tunnels large enough to drive a car in that were dug by neither - instead, scientists have a theory that these are the work of ancient, giant sloths. Jeff and Anthony discuss the theory, and suggest a few of their own.

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Today’s story was sent in by Jason Black: http://www.rawstory.com/2017/08/massive-caves-in-southern-brazil-are-actually-ancient-ground-sloth-burrows/

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