有蹄类哺乳动物包括猪、河马、骆驼、鹿、羚羊、绵羊与山羊等，而鼠鹿是其中最小的一类。
Mouse deer are the smallest members of the animal family that includes pigs, hippos, camels, deer, antelopes, sheep and goats.
他们认为增加狼的数量，可以减少有蹄类哺乳动物的数目，以此来提高单位面积内生物数量以及生物多样化。
More wolves, they argue, would result in fewer hoofed mammals which in turn would lead to greater plant biomass and diversity.
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