New fossil evidence upends long-held assumptions about how mammals gave birth
August 13, 2026
A fossilized growth signal in the bones of a 236-million-year-old cynodont may have revealed one of the earliest known examples of live birth in the mammalian lineage. The discovery, reported in Frontiers in Mammal Science, suggests that viviparity—the reproductive strategy in which embryos develop inside the mother and offspring are
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