曾有这么一则报道：美国某自然保护区为了繁殖梅花鹿，将狼群灭绝。结果十几年后，人们发现梅花鹿由于没有狼的追击，变得体态蠢笨，尽失天然之灵秀，人们只好又将狼引入，方恢复了鹿的生机，正所谓“引狼入室”。“物竞天择，适者生存”可谓人人尽知。每一个物种的起源、发展 There was such a story once reported that a certain nature reserve in the United States exterminated wolves in order to breed sika deer. Results ten years later, people found the sika deer wolf chase, became stupid, lost natural splendor, people had to introduce the wolf again, the parties restored the life of the deer, the so-called “lead wolf into the room.” “Natural selection, survival of the fittest” can be described as everyone knows. The origin and development of each species