• Monotremes are mammals that reproduce by laying eggs.
  • The only living monotreme species are the platypus and echidnas.
  • Platypus females lay their eggs in a burrow.
  • Echidna females have a pouch in which they store their eggs.
  • Monotreme reproduction is the least risky for the mother.
  • However, eggs are harder to protect than is an embryo or a fetus in a pouch or uterus.
  • The mother doesn’t need to eat more or put herself at risk by carrying and delivering a fetus.
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