A 165-million-year-old mammal fossil from China reveals some of the earliest evidence of chewing, swallowing, and suckling—distinctly mammalian traits. Named Megacauda sungei, the chihuahua-sized, semi-aquatic predator sheds light on mammalian evolution during the Jurassic.
165-Million-Year-Old Fossil Reveals Mammals Ancient Feeding Secrets
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