研究者说这有可能是由于哺乳动物向北部山脉移动、兽类短缺或是人类越来越偏爱其他的猎物种类造成的。
The researchers say this could be due to a northward range shift in the mammal, a scarcity of the beast, or an increasing human preference for other prey species.
在发现Juramaia前，已知的最早的真兽类动物是生活在1.25亿年前的Eomaia。
Before Juramaia's discovery, the oldest known eutherian was Eomaia that lived 125 million years ago.
分析了常见兽类动物的运动形态，概括归纳动画中表现动物运动的规律，设计出接近真实的动物运动形态。
The shapes of the common beasts movement are analyzed, the law of beasts movement in animated cartoon is summarized, the design of the shapes of beasts movement approach to the real one.
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