1. Whales are mammals; fish are not.
    鲸是哺乳动物；鱼则不是。

1. 哺乳类动物：哺乳类动物(Mammal)哺乳类是一种恒温、脊椎动物,身体有毛发,大部分都是胎生,并藉由乳腺哺育后代. 哺乳动物是动物发展史上最高级的阶段,也是与人类关系最密切的一个类群.

2. 哺乳类：大意为:鸟类和哺乳类(MAMMAL) 会通过后天学习改善行 为. 然后举例说,当一些观众鸟看见别的鸟在吃红色容 器里的食 物后出现不良症状(如拼命甩头) 就不再吃该容 器内食 物. 但有些鸟类(AVIAN) 及禽类 不一样,

1. 哺乳动物
    Mammals are animals such as humans, dogs, lions, and whales. In general, female mammals give birth to babies rather than laying eggs, and feed their young with milk.

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1. any warm-blooded vertebrate having the skin more or less covered with hair
    young are born alive except for the small subclass of monotremes and nourished with milk

    Synonym: mammalian