Only two kinds of mammals, the platypus and the echidna, lay eggs.
只有两种哺乳动物,也就是鸭嘴兽和针鼹。
For mammals like echidnas and kangaroos, the water proved too great a hurdle.
对于针鼹和袋的哺乳动物来说,海水是一个非常大的障碍。
There were once hundreds of monotreme species, but there are only five left: four species of echidnas and the duck-billed platypus.
曾经有好几百种单孔目哺乳动物,现在仅存5种:4种针鼹和鸭嘴兽。
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