鸭嘴兽和针鼹鼠是世界上唯一的单孔类动物。
The world's only monotremes are the platypus and the echidna.
牐2000年澳大利亚奥运会吉祥物之一是针鼹鼠。
One of the mascots for the 2000 Olympics, in Australia, is the echidna.
因针鼹鼠之独特，被定类为特殊的哺乳动物，属单孔类动物。单孔类动物只有针鼹鼠和鸭嘴兽。
The echidna is such a unique animal that it is classified in a special class of mammals known as monotremes, which it shares only with the platypus.
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