| 41. | In placental mammals this process of gestation occurs inside the reproductive system of the mother of the embryo.
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| 42. | The exceptions to dichromatic vision in placental mammals are monochromats, and both sexes of howler monkeys are trichromats.
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| 43. | In extant placental mammals, the maximum dental formula is : Mammal teeth are usually symmetrical, but not always.
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| 44. | Further evidence is needed, however, to indicate whether that was important in their diverging from placental mammals, they added.
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| 45. | Afrotheria is now recognized as one of the three major groups within the Eutheria ( containing placental mammals ).
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| 46. | Marsupial and placental mammals do not lay eggs, but their unborn young do have the complex tissues that identify amniotes.
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| 47. | In healthy humans ( and placental mammals the male ejects urine through the penis, and the female through the vulva.
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| 48. | Mammals found to possess these genes include monotremes ( platypus ) and marsupials ( opossum ) but not placental mammals.
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| 49. | See list of placental mammals and list of monotremes and marsupials for more detailed information on mammal genera and species.
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| 50. | This find suggests that placental mammals did coexist with marsupials in Australia in the early Tertiary, although only marsupials persisted.
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