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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 basal mammals that lay eggs (Prototheria) instead of giving birth to live young, like marsupials (Metatheria) and placental mammals (Eutheria).

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

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.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.nhc.ed.ac.uk/index.php?page=493.167

Monotremes are the only group of mammals that lay eggs, i.e. they are oviparous, laying one to three eggs. They have a single posterior opening, the cloaca, ...

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,  ...

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 ...