外迹是由Martinsson（1970年）提出的遗迹化石保存分类的。
这些弯曲的星迹有一个明显的圆心，这就是南天极，它位于画面左上方边缘外一点点的位置上。
At the apparent center of the curving trails, the South Celestial Pole lies just off the upper left edge.
目的塑料地板胶制鼠迹板测试居民区住宅外鼠密度可行性。
Objective To study the feasibility on the rat density tested by the plastic rat trace board in residential districts.
犬不能有明显的斑迹，除了耳、吻部、尾尖的黑色外，所有这些地方理想的颜色为深色，甚至黑色。
The dog must have no distinctive markings except for the desirable black points of ears, muzzle and tip of tail, all of which points are preferably dark even to black.
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