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  2. Monotreme - Wikipedia

    en.wikipedia.org/wiki/Monotreme

    Monotremes (/ ˈ m ɒ n ə t r iː m z /) are mammals of the order Monotremata. They are the only group of living mammals that lay eggs, rather than bearing live young. The extant monotreme species are the platypus and the four species of echidnas. Monotremes are typified by structural differences in their brains, jaws, digestive tract ...

  3. List of monotremes and marsupials - Wikipedia

    en.wikipedia.org/wiki/List_of_monotremes_and...

    The class Mammalia is divided into two subclasses based on reproductive techniques: egg-laying mammals (yinotherians or monotremes - see also Australosphenida), and mammals which give live birth . The latter subclass is divided into two infraclasses: pouched mammals ( metatherians or marsupials ), and placental mammals ( eutherians , for which ...

  4. Ornithorhynchoidea - Wikipedia

    en.wikipedia.org/wiki/Ornithorhynchoidea

    Ornithorhynchoidea is a superfamily of mammals containing the only living monotremes, the platypus and the echidnas, as well as their closest fossil relatives, to the exclusion of more primitive fossil monotremes of uncertain affinity.

  5. Understanding the Sixth Sense of the Platypus - AOL

    www.aol.com/understanding-sixth-sense-platypus...

    Other monotremes also have developed the ability to electrolocate, but the platypus is the best at it among the monotremes. While the echidna species has 400 to 2,000 electroreceptor skin cells ...

  6. Mammalian reproduction - Wikipedia

    en.wikipedia.org/wiki/Mammalian_reproduction

    However, the five species of monotreme, the platypuses and the echidnas, lay eggs. The monotremes have a sex determination system different from that of most other mammals. [ 2 ] In particular, the sex chromosomes of a platypus are more like those of a chicken than those of a therian mammal.

  7. Category : Category-Class Monotremes and marsupials pages

    en.wikipedia.org/wiki/Category:Category-Class...

    Pages in category "Category-Class Monotremes and marsupials pages" The following 20 pages are in this category, out of 20 total. This list may not reflect recent changes .

  8. Category:Monotremes - Wikipedia

    en.wikipedia.org/wiki/Category:Monotremes

    This category contains articles about all taxa below the subclass/order Monotremata - the platypus, the echidnas, and extinct species which are only known via fossil evidence. Subcategories This category has the following 5 subcategories, out of 5 total.

  9. Wikipedia:WikiProject Tree of Life/Marsupial poll - Wikipedia

    en.wikipedia.org/wiki/Wikipedia:WikiProject_Tree...

    The older system was essentially the same, but used the names Monotremata, Marsupialia, and Placentalia. The older system referred to the unique features of each group's reproductive system. Monotremes are unique because their urinary, excretory, and reproductive systems share the same opening (monotreme means 'single opening' in Greek).