The aftermath of the KPG extinction event which saw all of the nonavian dinosaurs go extinct, as well as a large swath of other animals at the end of the Mesozoic left open a great amount of niches in its aftermath. Said niches, particularly those of large herbivores, were swiftly filled by many taxa, many of them being mammals, which were now unburdened by the presence of the dinosaurs, one of these key early groups being the Dinoceratans or Uintatheres. I hope you enjoy.

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Sources:
https://en.wikipedia.org/wiki/Uintath...
https://en.wikipedia.org/wiki/Dinocerata'>https://en.wikipedia.org/wiki/Dinocerata
https://en.wikipedia.org/wiki/Gobiath...
https://en.wikipedia.org/wiki/Prodino...
https://en.wikipedia.org/wiki/Eobasileus
https://en.wikipedia.org/wiki/Dinocerata'>https://en.wikipedia.org/wiki/Dinocerata
https://www.nature.com/articles/147114b0
https://www.researchgate.net/publicat...
https://blogs.scientificamerican.com/...
https://www.itakehistory.com/post/sci...
https://bizarrezoology.wordpress.com/...

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