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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.britannica.com/animal/monotreme

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

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.scientificamerican.com/article/extreme-monotremes

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 “monotremes” once  ...

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  ...

www.dictionary.com/browse/monotreme

Monotreme definition, any animal of the Monotremata, the most primitive order of mammals, characterized by certain birdlike and reptilian features, as hatching ...

www.merriam-webster.com/dictionary/monotreme

Define monotreme: any of an order (Monotremata) of egg-laying mammals comprising the platypuses and echidnas.

www.dltk-kids.com/animals/monotreme.htm

A monotreme is a rare sort of mammal found in Australia, Tasmania and New Guinea. The reason they are so rare is that they lay eggs! This group includes the  ...