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Re:A Bridge Made of Grass by Raphmedia on Tuesday June 18, 2019 @12:03PM (#20214576)
What you imagined do exist. They use them to allow animals to migrate across highways without putting them in danger.

See this: https://www.canadiangeographic.ca/article/banffs-famed-wildl...

Re:A Bridge Made of Grass by dymk on Tuesday June 18, 2019 @01:42PM (#20215898)
I wouldn't really call that naturally formed in the sense GP was talking about - any more than a building with a green roof, at least