What is a monotreme? | 就是愛看書
![What is a monotreme?](https://i.imgur.com/y8QtHep.jpg)
Monotremesaredifferentfromothermammalsbecausetheylayeggsandhavenoteats.Themilkisprovidedfortheiryoungbybeingsecretedbymanyporeson ...
![What is a monotreme?](https://i.imgur.com/y8QtHep.jpg)
Ornithorhynchus anatinus, is a unique Australian species. Along with echidnas, platypus are grouped in a separate order of mammals known as monotremes, which are distinguished from all other mammals because they lay eggs.
The platypus and echidna have both survived by occupying ecological niches. The soft egg-laying habit of monotremes is a notable reptilian feature that has been kept in this group of mammals.
Like the platypus, the echidna has an electroreceptive system. While the platypus has 40,000 electroreceptors on its bill, echidnas have only 400-2,000 electroreceptors on their snouts.
The platypus has a leathery beak which works very well as a device for sifting small invertebrates from the bottom of a river bed. It is richly supplied with touch and electro- receptors that can detect weak currents emitted by the muscles of its prey.
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12.31 | 就是愛看書
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Monotremes | 就是愛看書
What is a monotreme? | 就是愛看書
![](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...