
1) Duckbill or echidna 2) Egg-laying mammal 3) Prototherian
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https://www.crosswordclues.com/clue/monotreme

1) Echidna 2) Platypus
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https://www.crosswordclues.com/clue/monotreme

Monotremes (from the Greek μονός monos `single` + τρῆμα trema `hole`, referring to the cloaca) are mammals that lay eggs (Prototheria) instead of giving birth to live young like marsupials (Metatheria) and placental mammals (Eutheria). The only surviving examples of monotremes are all indigenous to Australia and New Guinea, although...
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http://en.wikipedia.org/wiki/Monotreme

• (n.) One of the Monotremata.
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http://thinkexist.com/dictionary/meaning/monotreme/

any member of the egg-laying mammalian order Monotremata, which includes the amphibious platypus (family Ornithorhynchidae) and the terrestrial ... [6 related articles]
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http://www.britannica.com/eb/a-z/m/114

A type of mammal that lays eggs. The echidna and duck-billed platypus are the only two mammal species in the monotreme classification.
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http://www.encyclo.co.uk/local/22217
Mon'o·treme noun [ Confer French
monotrème .]
(Zoology) One of the Monotremata.
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http://www.encyclo.co.uk/webster/M/97

Type: Term Pronunciation: mon′ō-trēm Definitions: 1. A member of the order Monotremata.
Found on
http://www.medilexicon.com/medicaldictionary.php?t=55967

Monotreme refers to any member of the order Monotremata
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http://www.probertencyclopaedia.com/browse/BM.HTM

[
n] - the most primitive mammals comprising the only extant members of the subclass Prototheria
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http://www.webdictionary.co.uk/definition.php?query=monotreme
egg-laying mammal noun the most primitive mammals comprising the only extant members of the subclass Prototheria
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https://www.encyclo.co.uk/local/20974
Click images to enlargeAny of a small group of primitive egg-laying mammals, found in Australasia. They include the echidnas (spiny anteaters) and the platypus. (Order Monotremata.) In 1995 Australian palaeontologists announced a new (extinct) family of monotreme, the Kollikodontidae, following the discovery of a 120&...
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https://www.encyclo.co.uk/local/21221

any animal of the Monotremata, the most primitive order of mammals, characterized by certain birdlike and reptilian features, as hatching young from eggs, and having a single opening for the digestive, urinary, and genital organs, comprising only the duckbill and the echidnas of Australia and New Guinea.
Found on
https://www.infoplease.com/dictionary/monotreme
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