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
Monotreme (order Monotremata), any member of the egg-laying mammalian
order Monotremata, which includes the amphibious platypus (family ...
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 probably split from the lineage leading to other mammals sometime
in the Mesozoic. They are often placed in a separate subclass from other ...
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, ...
Sep 25, 2008 ... Monotremes are egg-laying mammals of the order Monotremata, the only order in
Subclass Monotremata (or Prototheria). Monotremes ...
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