This video looks at a group of amazing creatures that existed before the dinosaurs like dimetrodon, gorgonopsids and dicynodonts. We often assume primitive animals lived back then but these animals where anything but, evolving certain features that all mammals possess.

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Music:    • ♩♫ Inspiring and Uplifting Trailer Mu...  

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Sources:
https://www.ncbi.nlm.nih.gov/pubmed/1...
https://www.ncbi.nlm.nih.gov/pubmed/?...
https://www.ncbi.nlm.nih.gov/pmc/arti...
https://www.ncbi.nlm.nih.gov/pmc/arti...