by Ciro Santilli (@cirosantilli, 36)
They split up from the rest of the mammals after the monotremes.
Every other mammal has a placenta.
This baby in pouch thing just feels like a pre-placenta stage.

Ancestors (25)

  1. Theria subclade
  2. Theria
  3. Mammal subclade
  4. Mammal
  5. Synapsid subclade
  6. Synapsid
  7. Amniote subclade
  8. Amniote
  9. Tetrapod subclade
  10. Tetrapod
  11. Fish subclade
  12. Fish
  13. Vertebrate
  14. Chordate subclade
  15. Chordate
  16. Animal subclade
  17. Animal
  18. Eukarya subclade
  19. Eukaryote
  20. Species
  21. Taxonomy
  22. Biology
  23. Natural science
  24. Science
  25. Home

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