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美国黄石国家森林公园曾经发生过这么一件事:因为害怕狼群对于人类的伤害,人们消灭了狼,使得原本生活艰辛的虎群没有天敌,过上了悠闲的生活,但是好景不长,没过多久,过惯了无忧无虑生活的鹿群只会享受青草绿地,阳光美景,失去了警觉,进而导致整个鹿群体质退化,死亡率大大增加。人们百思不得其解,为什么失去天敌的鹿群反而不如原来生活的好呢?生态学家解释了原因:鹿群之所以体质退化,根本原因是狼群的消失导致鹿群没有了生存压力,如果再次引入狼群,一切问题就能够解决。果然,随着狼群的进入,鹿群又出现了往日的生机。
There was such a thing happened in the Yellowstone National Forest Park in the United States that wolves were wiped out because of fear of the wolves' harm to human beings, making the predators of the hard-working tigers have no predators and had a leisurely life, Soon after, deer groups who have lived in a carefree life will only enjoy the green grass, the beauty of the sun and their vigilance, which will lead to the deterioration of the deer's physical constitution and greatly increase the mortality rate. Ecstaticists explained why: deer herd physical deterioration, the fundamental reason is the disappearance of wolves led to deer herd there is no survival pressure, If introduced again wolves, all problems can be solved. Sure enough, with the arrival of the wolves, deer herd appeared the vitality of the past.