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.
潘克洛夫只发现了兽类的脚印，动物新近遗留下来的脚印，但是他不知道那究竟是些什么动物；
Pencroft only saw traces of quadrupeds, fresh footprints of animals, of which he could not recognize the species.
但由于动物的某些生物学特性，不同兽类的活动会在野外留下特定的踪迹，这为野外鉴别、观察和研究提供了重要的线索。
Different mammals would leave different marks of activities and special carry-overs, which have provided important clues and evidence for the identifications, observations and studies of wild mammals.
兽类的后腿某些动物后腿的股部，尤指猪。
The thigh of the hind leg of certain animals, especially a hog.
传统的兽类分类学仅把哺乳动物毛皮特征作为参照，多以骨骼和牙齿作为分类依据，淡化了毛和毛被的分类鉴别作用。
Mostly bones and teeth used as a classification of traditional taxonomic zoology. Fur characteristics were counted as a reference, the characteristics of fur and hair were overlooked.
传统的兽类分类学仅把哺乳动物毛皮特征作为参照，多以骨骼和牙齿作为分类依据，淡化了毛和毛被的分类鉴别作用。
Mostly bones and teeth used as a classification of traditional taxonomic zoology. Fur characteristics were counted as a reference, the characteristics of fur and hair were overlooked.
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