A 236-million-year-old fossil from Argentina is giving scientists a surprising new look at one of the most important developments in mammalian evolution: live birth. Researchers studying the fossil of Chiniquodon theotonicus, a distant mammalian relative that lived during the Triassic Period, have found evidence suggesting that this animal may have given birth to live young rather than laying eggs. If confirmed by additional fossils, the discovery could push the origin of live birth in the mammalian lineage back by as...Click for full post