Ornithorhynchus is a genus of monotremes containing the platypus and its close extinct relatives. In contemporary usage, it refers to the sole living representative, the platypus, a semi-aquatic mammal native to eastern Australia. The term combines Greek roots for bird (ornith-), snout (rhynch-), and the reptile-like (enclosing) structure, reflecting its bird-like bill and animal lineage.
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