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Egg-laying mammals are known as monotremes, and they include the platypus and the echidna. Their characteristics are:

  • unlike placental mammals and marsupials, they do not give live birth, but lay eggs in order to reproduce
  • monotremes nurture their young with mothers' milk as all mammals do
  • they have four limbs
  • they are warm-blooded vertebrates
  • they have a four-chambered heart
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13y ago

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