12.31 | 就是愛看書
2021年3月5日—Monotremesreproducebylayingeggs.·Monotremeshaveacloacainsteadofauterusandvagina.Theeggspassthroughtheopeningofthecloaca.
Can a mammal lay an egg?
This is a mammal. But it is unlike placental or marsupial mammals. If a mammal does not develop within a placenta or a pouch, what type of development is left? Eggs!
MonotremesOnly five living species[1] of mammals are not therian mammals. They are called monotremes.Monotremes are mammals that reproduce by laying eggs. The only living monotreme species are the platypus and echidnas (see Figure below[2] and Figure below[3]). They are found solely in Australia and New Guinea (an island not far from Australia).
This egg-laying, venomous, duck-billed, beaver-tailed, otter-footed mammal is a platypus, a monotreme mammal that reproduces by ...
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《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...