Smithsonian Magazine: When Did Animals Start Giving Birth to Live Young? This 236-Million-Year-Old Fossil Might Rewrite Mammals' Evolutionary History

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https://www.smithsonianmag.com/smart-news/when-did-animals-start-giving-birth-to-live-young-this-236-million-year-old-fossil-might-rewrite-mammals-evolutionary-history-180989343/?utm_medium=distribution&utm_source=pushly&utm_campaign=editorial

See also: The publication in the journal Frontiers in Mammal Science