Sites

A Checklist of the Mammals of the World: Monotremes and Marsupials - English
URL: http://www.interaktv.com/MAMMALS/Marsup.html

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Systematics of the Monotremata - English
URL: http://www.ucmp.berkeley.edu/mammal/monotremesy.html

Living monotremes are classified in two families, the Ornithorhynchidae (platypus family) and the Tachyglossidae (echidnas). A summary of living and fossil species currently recognized follows (an asterisk indicates a species which has gone extinct).

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