The Rise and Fall of the Tallest Mammal to Walk the Earth

From PBS Eons.

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!

Produced in collaboration with PBS Digital Studios: http://youtube.com/pbsdigitalstudios

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References: https://docs.google.com/document/d/109ZmNyIVhU8Qkp-mcYpqLJa276E8c6c_YPVTvISZU-s/edit?usp=sharing