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Introduction to the Monotremata

https://ucmp.berkeley.edu/mammal/monotreme.html

“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 Australia and New Guinea. Monotremes are not a very diverse group today, and there has not been much fossil information known until...” (from the page’s text)

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