| 11. | They share a similar fauna which includes marsupial and monotreme mammals and ratite birds.
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| 12. | Its eggs were probably small and leathery, a condition still found in monotremes.
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| 13. | The monotremes are the only group of land mammals known to have evolved electroreception.
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| 14. | Platypuses are a monotreme species whose mechanism of sex determination has been extensively studied.
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| 15. | Most recent phylogenetic studies validate this clade, lumping henosferids and aukstribosphenids alongside monotremes.
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| 16. | There is currently some debate regarding monotreme taxonomy.
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| 17. | Monotremes, like marsupials, produce larval young.
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| 18. | The platypus is a monotreme, a mammal that lays eggs to hatch its young.
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| 19. | Subsequent monotreme molars are multi-rooted.
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| 20. | Modern monotremes have a low body temperature compared to marsupials and placental mammals, around.
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