国外一家森林公园曾养殖几百只梅花鹿,尽管环境幽静,水草丰美,又没有天敌,但几年以后,鹿群非但没有发展,反而病的病,死的死,竟然出现了负增长。后来公园买回几只狼放置在公园里,在狼的追赶捕食下,鹿群只得紧张地奔跑以逃命。这样一来,除了那些老弱病残者被狼捕食外,其它鹿的体质日益增强,数量也迅速地增长着。 A few hundred sika deer have been raised in a forest park overseas. Despite the quiet environment and the lush plants and no natural enemies, a few years later, the deer not only failed to develop but the sick and dead died unexpectedly. Later, the park bought a few wolves placed in the park, the wolf catching predators, the deer had to run nervously to escape. As a result, except for those who are sick and wounded by the wolf prey, the other deer’s growing physique, the number also increased rapidly.