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    https://en.wikipedia.org/wiki/Monotreme

    Monotreme - Wikipedia

    Monotremes 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, reproductive … 展开

    General characteristics

    Like other mammals, monotremes are endothermic with a high metabolic rate (though not as high as other mammals; see below); have hair on their bodies; produce milk through mammary glands to feed their young; have a … 展开

    Taxonomy

    The traditional "Theria hypothesis" states that the divergence of the monotreme lineage from the Metatheria (marsupial) and Eutheria (placental) lineages happened prior to the divergence between marsupials and placental mammals, and this explains why … 展开

    Further reading

    • Nowak, Ronald M. (1999). Walker's Mammals of the World (6th ed.). Baltimore, MD: Johns Hopkins University Press. ISBN 展开

    Fossil monotremes 图像
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    Physiology

    Monotremes' metabolic rate is remarkably low by mammalian standards. The platypus has an average body temperature of about 31 °C (88 °F) rather than the averages of 35 … 展开

    Fossil monotremes

    The first Mesozoic monotreme to be discovered was the Cenomanian (100–96.6 Ma) Steropodon galmani from Lightning Ridge, New South Wales. Biochemical and anatomical evidence suggests that the monotremes diverged from the mammalian … 展开

    External links

    • "Introduction to Monotremes". U.C. Museum of Peleontology. University of California – Berkeley. 展开

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  3. Britannica
    https://www.britannica.com/animal/mo…

    Monotreme | Definition, Characteristics, Reproduction, …

    Monotreme, any member of the egg-laying mammalian order Monotremata, which includes the amphibious platypus and the terrestrial echidnas of continental Australia, the Australian island state of Tasmania, and the island of New …

  4. 维基百科
    https://zh.wikipedia.org/wiki/单孔目

    单孔目 - 维基百科，自由的百科全书

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  6. 百度百科
    https://baike.baidu.com/item/单孔目

    单孔目 - 百度百科

    物种概述. 播报. 编辑. 单孔目：哺乳纲的一目，最低等的哺乳动物。. 卵生。. 肠和尿殖管共同开口于泄殖腔，由一共同的孔通体外，故名“单孔目”。. 乳腺管开口于腹部两侧的乳腺区而无乳头；体有毛被；体温较低但具有调节体温的能力。. 如 …

  7. ThoughtCo
    https://www.thoughtco.com/monotreme…

    Overview of the Animals Called Monotremes

    2019年6月5日 · Monotremes (monotremata) are a unique group of mammals that lay eggs, unlike placental mammals and marsupials, who give birth to live young. Monotremes include several species of echidnas and the platypus.

    标记:
    Monotremes Mammals
    Monotreme Lower Classifications
    Mammals That Lay Eggs
  8. animalfact.com
    https://animalfact.com/monotreme

    Monotreme - Definition, List, Examples, Characteristics, …

    2024年7月9日 · These mammals derive their name from the Greek word monotreme, which means ‘single opening.’. This term refers to the single duct or cloaca that serves as the common exit point for their urinary, defecatory, and …

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    Moon River
    Mammals
  9. 其他用户还问了以下问题
    How are monotremes different from other mammals?
    Monotremes are typified by structural differences in their brains, jaws, digestive tract, reproductive tract, and other body parts, compared to the more common mammalian types. Although they are different from almost all mammals in that they lay eggs, like all mammals, the female monotremes nurse their young with milk.

    Monotreme - Wikipedia

    en.wikipedia.org
    Do monotremes lay eggs?
    Monotremes (monotremata) are a unique group of mammals that lay eggs, unlike placental mammals and marsupials, who give birth to live young. Monotremes include several species of echidnas and the platypus. The most striking difference from other mammals is that monotremes lay eggs. Similar to other mammals, they do lactate (produce milk).

    Overview of the Animals Called Monotremes - ThoughtCo

    thoughtco.com
    What is a monotreme echidna?
    Monotremes (/ ˈmɒnətriːmz /) are mammals of the order Monotremata. They are the only known 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.

    Monotreme - Wikipedia

    en.wikipedia.org
    How many monotremes are there?
    There are only five living monotreme species: the duck-billed platypus and four species of echidna (also known as spiny anteaters). All of them are found only in Australia and New Guinea. Monotremes are not a very diverse group today, and there has not been much fossil information known until rather recently.

    Monotremes - University of California Museum of Paleontology

    ucmp.berkeley.edu
    What does monotreme mean?
    Monotreme (monos, single + trema, hole) means "single opening" in Greek, and comes from the fact that their urinary, defecatory, and reproductive systems all open into a single duct, the cloaca. Other mammal females have separate openings for reproduction, urination, and defecation.

    Monotreme - New World Encyclopedia

    newworldencyclopedia.org
    Do monotremes have teats?
    Monotremes are members of the Monotremata suborder of prototherian mammals. Along with placentals and marsupials, they are one of the three subgroups of today’s living mammals. In addition to laying eggs, monotremes differ from other mammals in that they lack teats.

    What is a Monotreme? Monotremes Explained | A-Z Animals

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  10. Biology LibreTexts
    https://bio.libretexts.org/Bookshelves/Intr…

    12.31: Monotremes - Biology LibreTexts

    The only living monotreme species are the platypus and echidnas (see Figure below and Figure below). They are found solely in Australia and New Guinea (an island not far from Australia). This egg-laying, venomous, duck-billed, beaver …

    标记:
    Platypus Monotreme
    Monotremes
  11. University of California Museum of Paleontology
    https://ucmp.berkeley.edu/mammal/monotreme.html

    University of California Museum of Paleontology

  12. AZ Animals
    https://a-z-animals.com/blog/what-is-a-…

    What is a Monotreme? Monotremes Explained - A-Z …

    2023年4月13日 · Monotremes are mammals that lay eggs and produce milk, such as the platypus and the echidna. Learn about their evolution, diversity, behavior, habitat and conservation status in this guide.

    标记:
    Monotremes Mammals
    Monotremata
  13. New World Encyclopedia
    https://www.newworldencyclopedia.org/entry/Monotreme

    Monotreme - New World Encyclopedia

    标记:
    Monotremes Mammals
    List of Monotremes
    Monotremes Definition Biology