Only two kinds of mammals, the platypus and the echidna, lay eggs.
只有两种乳动物,也就是嘴兽针鼠会产蛋。
For mammals like echidnas and kangaroos, the water proved too great a hurdle.
对于针袋鼠这样的乳动物来说,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乳动物,现在仅存5种:4种针嘴兽。
Back on the road It didn't take long until we ran into one of Australia's weirdest animals: the echidna.
返回路上 没过多久,我们就遇到了澳大利亚最奇怪的动物之一:针。
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