31 Mar '17, 3pm

Are these massive tunnels in South America the work of giant sloths?

Are these massive tunnels in South America the work of giant sloths?

Massive tunnels in South America are likely the work of long-extinct giant mammals: https://t.co/tGuKj9V2YG pic.twitter.com/BVjjk885gZ — Discover Magazine (@DiscoverMag) March 30, 2017 Over the last several years, geologists in Brazil and Bolivia have uncovered massive peculiar caves that, they say, were not created by any natural process. One of the geologists, Heinrich Frank, a professor at the Federal University of Rio Grande do Sul, crawled inside one such tunnel in the Brazilian town of Novo Hamburgo. It was about 15 feet long, he told Discover Magazine , and at the end of the tunnel there were claw marks all over the ceiling. Frank said it was likely a "paleoburrow" dug by an extinct species of giant sloth, and once he found that tunnel, he began finding them in droves, Discover Magazine reports. Near the Brazilian city of Porto Alegre, for example, Frank and his stu...

Full article: http://www.mnn.com/earth-matters/animals/stories/massive-...

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