也可以当名词，意指雄鹿、雄兔、公羊或公山羊等特定的雄性动物。
Buck is also a noun that means a male of certain animal species such as deer, rabbits, sheep, or goats.
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.
农田动物也会污染水源。牛，猪，绵羊和山羊等动物通常在小溪或河边的广阔的草地上放牧。
Farm animals can also pollute water supplies. Animals like cattle, pigs, sheep and goats are often left to feed on grass in open fields bordered by streams or rivers.
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