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en.wikipedia.org/wiki/Monotreme

Monotremes are one of the three main groups of living mammals, along with placentals (Eutheria) and marsupials (Metatheria). The monotremes are typified by ...

www.ucmp.berkeley.edu/mammal/monotreme.html

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  ...

www.scientificamerican.com/article/extreme-monotremes

Dec 1, 2009 ... Only two kinds of egg-laying mammals are left on the planet today—the duck- billed platypus and the echidna, or spiny anteater. These odd ...

www.newworldencyclopedia.org/entry/Monotreme

Sep 25, 2008 ... Monotremes are egg-laying mammals of the order Monotremata, the only order in Subclass Monotremata (or Prototheria). Monotremes ...

www.britannica.com/animal/monotreme

monotreme: Monotremata any member of the egg-laying mammalian order Monotremata, which includes the amphibious platypus (family Ornithorhynchidae ) ...

carm.org/dictionary-monotreme

A monotreme is a mammal that lays eggs as in the order of Monotremata.

animaldiversity.org/accounts/Monotremata

Monotremes probably split from the lineage leading to other mammals sometime in the Mesozoic. They are often placed in a separate subclass from other ...

www.ask.com/youtube?q=Monotreme&v=xlprSsIUaZM
Sep 8, 2016 ... The isolation of Australia meant that some ancient animals were not forced to compete against other modern mammals. SUBSCRIBE and ...

www.ucl.ac.uk/museums-static/obl4he/vertebratediversity/monotremes.html

Whilst there has never been much doubt that monotremes split off from other mammal group at an early stage, due to their many ancestral reptilian characters  ...