Extreme Monotremes | 就是愛看書
![Extreme Monotremes](https://i.imgur.com/y8QtHep.jpg)
2009年12月1日—Onlytwokindsofegg-layingmammalsareleftontheplanettoday—theduck-billedplatypusandtheechidna,orspinyanteater.
![Extreme Monotremes](https://i.imgur.com/y8QtHep.jpg)
December 1, 2009
3 min read
Extreme Monotremes: Why Do Egg-Laying Mammals Still Exist?
Ancestors of the duck-billed platypus and the echidna may have survived their live-birthing competitors by taking to the water
Only two kinds of egg-laying mammals are left on the planet today—the duck-billed platypus and the echidna, or spiny anteater. These odd “monotremes” once dominated Australia, until their pouch-bearing cousins, the marsupials, invaded the land down under 71 million to 54 million years ago and swept them away. New research suggests these two kinds of creatures managed to survive because their ancestors took to the water.
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![](https://i.imgur.com/y8QtHep.jpg)
《We are marsupials》凱撒琳 978-957-506-218-7 (平裝, 36面, 20X21公分)
《Wearemarsupials》好看嗎?作者authorFelixHong由「凱撒琳」出版,ISBN:978-957-506-218-7(平裝,36面,20X21公分),以下為...