animals

Do All Vertebrates Have a Cloaca?

šŸ’” The Answer

  • A cloaca is the rear orifice serving digestive, reproductive, and urinary tracts.
  • All amphibians, reptiles, birds, cartilaginous fish, and a few mammals have it.
  • Most placental mammals have separate orifices for evacuation and reproduction.
  • Therefore, not all vertebrates have a cloaca.

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