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It arose from rhino ancestors that were a lot smaller, but Paraceratherium would take a different evolutionary path. Believe it or not, it actually became so big that it probably got close to what scientists think might be the actual upper limit for a land mammal. 

The illustration of Paraceratherium used in the thumbnail is by Dmitry Bogdanov!

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References: https://docs.google.com/document/d/10...