Lower mammalian species such as mice and rats, which most likely lack the lofty principles and motivations of humans, may care for their pups for the simple reason that it feels good to do so.

 
  • 像大鼠及小鼠這種較低等的哺乳動(dòng)物,并不像人類(lèi)擁有崇高的原則與動(dòng)機,牠們可能只是因為感覺(jué)良好而照顧幼兒。
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