Monotremata
  單孔目
  Mono·trema·ta /ˌmɑnəˈtrɛmətə, ˈtrɪm-/ 名詞 複數
  單孔目(動物)
  Mon·o·trem·a·ta n. pl.  Zool. A subclass of Mammalia, having a cloaca in which the ducts of the urinary, genital, and alimentary systems terminate, as in birds.  The female lays eggs like a bird. See Duck mole, under Duck, and Echidna.
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  Monotremata
       n : coextensive with the subclass Prototheria [syn: order
           Monotremata]