长期以来,野生动物(特别是兽类)调查面临着许多现实困难:一是许多野生动物种群数量逐渐减少,甚至濒临灭绝,很难在野外见到活体。二是按照法律规定,未经许可,许多珍稀动物种类禁止采集实体样本。三是许多动物昼伏夜出,活动隐秘,很难观察到实体, For a long time, there are many realistic difficulties in the investigation of wildlife (especially mammals): First, the number of wildlife populations is gradually decreasing and even extinct. It is very hard to see the living things in the wild. Second, according to the law, many rare species of animals are forbidden to collect physical samples without permission. Third, many animals nocturnal, activity hidden, it is difficult to observe the entity,