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The key anatomical difference between monotremes and other mammals gives them their name; monotreme means "single opening" in Greek, referring to the single duct (the cloaca) for their urinary, defecatory, and reproductive systems. Like birds and reptiles, monotremes have a single cloaca. Marsupials have a separate genital tract, whereas most placental females have separate openings for reproduction (the vagina), urination (the urethra),

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