生物学家在非洲调查野生大象活动情况时发现,一些非洲大象正在迅速发生变异。在野生大象栖息地,平均有4%的非洲象自出娘胎起就没有长牙,这个数据比以前的调查猛增了5倍。最近,我国野生动物学家发现,在我国西双版纳的亚洲象 Biologists surveyed the activities of wild elephants in Africa and found that some African elephants are rapidly mutating. In the wild elephant habitat, an average of 4% of African elephants have had no teeth since their first birth, a figure that has soared 5 times over the previous survey. Recently, Chinese wildlife experts found that the Asian elephants in Xishuangbanna, China