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Theria (Mammals that don't lay eggs, wild beast)

Every mammal except the weird monotremes, i.e. marsupials and the placentalia.
The name is completely random, "wild beast". Are platypuses not "wild beasts"? They have a freaking poison!!

Ancestors

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