Science, U.S. News, World
Massive caves in southern Brazil are actually ancient ground sloth burrows
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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, these are the work of ancient, giant sloths. Image credits Amilcar Adamy. The massive burrows are estimated to be at…

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