This video looks into the tiny mammals that lived in the shadow of the dinosaurs showing how diverse they were and explaining a little bit about how they evolved into their current groups.

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Sources:
https://www.sciencedaily.com/releases...
https://www.researchgate.net/publicat...
https://www.ncbi.nlm.nih.gov/pubmed/2...
https://www.researchgate.net/publicat...