单孔目哺乳动物,卵生,泌尿、生殖和消化功能共用单一开口(泄殖腔)；包括针鼹、鸭嘴兽或其已灭绝的近亲。
单孔目哺乳动物,卵生,泌尿、生殖和消化功能共用单一开口(泄殖腔)；包括针鼹、鸭嘴兽或其已灭绝的近亲。；单孔目动物；[医] 单孔类
单孔目哺乳动物,卵生,泌尿、生殖和消化功能共用单一开口(泄殖腔)；包括针鼹、鸭嘴兽或其已灭绝的近亲。
Any of the order Monotremata of mammals that lay eggs and have single orifices for urogenital and digestive functions (cloaca); an echidna, platypus or one of their extinct relatives.
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