| 21. | There is cytological evidence that the low metabolism of monotremes is a secondarily evolved trait.
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| 22. | Its species include tree kangaroos and two types of egg-laying mammals, or monotremes.
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| 23. | A group of mammals called monotremes lay eggs, and their young are hatchlings as well.
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| 24. | The native fauna consists of marsupials and monotremes, reptiles, amphibians, bats and birds.
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| 25. | Monotremes, by the way, have a sex determination system akin to those of birds.
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| 26. | But much of what biologists surmised about monotremes over the years has turned out to be wrong.
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| 27. | The evolution of erect limbs in mammals is incomplete living and fossil monotremes have sprawling limbs.
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| 28. | They most likely evolved with mammal and marsupial hosts, only later moving to birds and monotremes.
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| 29. | See List of monotremes and marsupials, and for the clades and families, see mammal classification.
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| 30. | The electroreceptors of monotremes consist of free nerve endings located in the mucous glands of the snout.
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