๐ฆด A 236-million-year-old fossil just pushed the origin of live birth back by 90 million years
Scientists studying Chiniquodon theotonicus, a dog-sized cynodont from Late Triassic Argentina, found a distinctive neonatal bone ring โ the same growth mark that forms at birth in modern placental mammals. The discovery, published in Frontiers in Mammal Science, suggests live birth evolved in the mammal lineage far earlier than anyone thought. Makes you wonder: what else about our distant ancestors are we still getting completely wrong?
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