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.
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。
It cannot say that these observations evoked wild enthusiasm .
这不能说这些话引起极为热烈的反响。
Careful observations in the wild support the idea that some can.
通过在自然环境下的一些仔细观察发现有的动物能数数。
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