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 ...
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 ...
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Monotremes are the most primitive mammals. There are three species of
monotremes, the duck-billed platypus (Ornithorhynchus) and two spiny anteaters,
Sep 25, 2008 ... Monotremes are egg-laying mammals of the order Monotremata, the only order in
... Monotreme reproduction is also unique among mammals.
Monotreme definition, any animal of the Monotremata, the most primitive order of
mammals, characterized by certain birdlike and reptilian features, as hatching ...
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
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.