Longer, more infoheavy video answering a simple question: how did the age of mammals begin? Who were the predecessors of Megatherium or Smilodon? What were they like? All that and more are answered, along with plenty of tongue twisting scientific words, confusing taxonomic families, and way too many ‘rodentlike, tree climbing generalists’.

Wikipedia Articles for the animals if you want to learn more about them:
Multituberculates: https://en.wikipedia.org/wiki/Multitu...
Marsupials: https://en.wikipedia.org/wiki/Marsupial
Sparassodonta: https://en.wikipedia.org/wiki/Sparass...
Insectivora: https://en.wikipedia.org/wiki/Insecti...
Lepticitida: https://en.wikipedia.org/wiki/Leptictida
Pantolestidae: https://en.wikipedia.org/wiki/Pantole...
Carnivora: https://en.wikipedia.org/wiki/Carnivora
Creodonta: https://en.wikipedia.org/wiki/Creodonta
Condylarths: https://en.wikipedia.org/wiki/Condylarth
Cimolesta: https://en.wikipedia.org/wiki/Cimolesta
Taeniodonta: https://en.wikipedia.org/wiki/Taeniod...
Pantodonta: https://en.wikipedia.org/wiki/Pantodonta
Uintatherium: https://en.wikipedia.org/wiki/Uintath...
Plesiadapiforms: https://en.wikipedia.org/wiki/Plesiad...


Sources Used:
https://brilliantmaps.com/distributio...
http://gambassa.com/public/project/27... https://www.neversuchinnocence.com/su...
https://www.sciencedirect.com/science...
https://www.thoughtco.com/auroch1093172
https://rewildingeurope.com/rewilding...


(Non royalty free) Videos used:
Note: All videos should presumably fall under fair use, as not only is a small fraction of the video used, but my video and the means I use these videos falls under education.
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Music by Chris Zabriskie