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



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  ...



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

Monotremes: EnchantedLearning.com


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

Sep 14, 2014 ... Looks at the nature of Monotremes - or egg-laying mammals - the platypus and Echidnas, Describes their features and looks at how they live ...

Monotreme Records


KHOMPA's cutting-edge drum/electronic triggering project debut album 'The Shape Of Drums To Come' will be released on the 2nd of September. Watch the ...

Monotreme - New World Encyclopedia


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

Monotreme | Define Monotreme at Dictionary.com


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

Monotreme - definition of monotreme by The Free Dictionary


Any of various egg-laying mammals of the order Monotremata of Australia and New Guinea, whose only living members are the platypus and the echidnas.

Monotremes and marsupials


Noneutherian mammals: monotremes and marsupials. Phylogenetically isolated from other mammals. monotremes-others, diverged ~190 mya. marsupials- ...

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 >>
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monotreme | mammal | Britannica.com


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

Extreme Monotremes: Why Do Egg-Laying Mammals Still Exist ...


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  ...

Natural History Collections: Monotremes


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, ...