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News
Chiniquodon’s bone puts live birth in mammals 90 million years earlier than thought
6+ hour, 49+ min ago (592+ words) Chiniquodon theotonicus — a carnivorous, dog-sized animal from the Triassic — left a message in its bone: a microscopically thin growth ring that only forms at birth, in live-bearing animals. The specimen, found in northwestern Argentina and catalogued as CRILAR PV109, is 236 million…...