Robuta

https://www.sciencetimes.com/articles/27672/20201012/200-million-year-old-first-mammals-lived-reptiles.htm
A research team of European scientists analyzed 200 million-year-old teeth that belonged to some of the earliest mammals, suggesting that these animals lived...
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https://www.popsci.com/environment/first-mammal-ancestor/
The genome of the earliest known mammal ancestor has been reconstructed by an international team of researchers.
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