现在在巴黎大学的顾尚说,低于某特定规模的狗群会陷入一种恶性循环。少量的繁殖和低存活率进一步减小了狗群的规模,最终导致整个狗群的消亡。顾尚说人类行为导致的死亡可能是使狗群成员数量低于可维持的最低点的原因。伦敦动物学研究所的哺乳动物生态学家克里斯卡波恩也同意这种说法。他说保持非洲野狗群的完整对保护该物种是重要的。
★1).The African wild dog has been endangered.-R
★2).The spotted hyena is on the verge of extinction.-W
★3).The remaining lions will die out within decades.-N
★4).The dominant females is always left behind to protect the young.-W
★5).There is a tension between babysitting and hunting.-R
★6).The size of a pack must be big enough for it to survive.-R
★7).Steps will be taken to protect the African wild dog.-N
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