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Order Monotremata
2 families, 3 genera and 3 species currently represent the monotreme order. The fossil history of monotremes goes back from early Cretaceous to Recent in New Guinea and Australia, and early Pliocene in South America. In Australia, two... More >>

en.wikipedia.org/wiki/Monotreme

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

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.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.britannica.com/animal/monotreme

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

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.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 ...

animals.mom.me/examples-monotreme-animals-7555.html

Monotreme Basics. Scientists now know that duck-billed platypuses and their relatives the echidnas, or spiny anteaters, form a strange animal lineage known as ...

www.enchantedlearning.com/subjects/mammals/monotreme

Monotremes are the most primitive mammals. There are three species of monotremes, the duck-billed platypus (Ornithorhynchus) and two spiny anteaters,  ...