165-Million-Year-Old Otter-Like Mammal Fossil Found in China

Researchers discovered a fossil of Megacauda sungei, a 165-million-year-old otter-like mammal, in Inner Mongolia, China. The find provides new insights into early mammalian evolution, suggesting semiaquatic adaptations appeared earlier than previously thought. The discovery is based on a single fossil, so its ecological context remains partially inferred.