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   |  | Entrez Taxonomy 
 
    
        | The Platypus (Ornithorhynchus anatinus) is a semi-aquatic
            mammal endemic to eastern Australia and Tasmania. Together with the
            four species of echidna, it is one of the five species of
            monotremes, the only mammals that lay eggs instead of giving birth
            to live young. It is the sole living representative of its family
            (Ornithorhynchidae) and genus (Ornithorhynchus), though a number of
            related species have been found in the fossil record. |   |  |  |