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nounthe most primitive mammals comprising the only extant members of the subclass Prototheria
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Definition that contains monotreme
- mammal 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
- platypus small densely furred aquatic monotreme of Australia and Tasmania having a broad bill and tail and webbed feet; only species in the family Ornithorhynchidae
- echidna a burrowing monotreme mammal covered with spines and having a long snout and claws for hunting ants and termites; native to Australia
- echidna a burrowing monotreme mammal covered with spines and having a long snout and claws for hunting ants and termites; native to New Guinea
- anteater a burrowing monotreme mammal covered with spines and having a long snout and claws for hunting ants and termites; native to New Guinea
- anteater a burrowing monotreme mammal covered with spines and having a long snout and claws for hunting ants and termites; native to Australia
- mammalian 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
- cloaca (zoology) the cavity (in birds, reptiles, amphibians, most fish, and monotremes but not mammals) at the end of the digestive tract into which the intestinal, genital, and urinary tracts open
- duckbill small densely furred aquatic monotreme of Australia and Tasmania having a broad bill and tail and webbed feet; only species in the family Ornithorhynchidae
- placental mammals having a placenta; all mammals except monotremes and marsupials