After experiencing the catastrophe at the end of the Mesozoic Era until modern times, there is still a primitive mammal hiding in Australia's "Utopia". This is the platypus living in Australia (and the echidna living on Irian Island. They already have hair on their bodies. They can keep warm; their body temperature is not high and changes, but it can still be maintained within a certain range; they have no nipples, but have mammary glands that can feed their young with milk; therefore, they should undoubtedly be a mammal. However, they reproduce However, they are not viviparous but oviparous, which makes them obviously primitive from their reptile ancestors. They are classified into an independent subclass - the only order in the subclass Prototherium - Monotreme Head.
platypus
Echidna
There is evidence that monotremes were an early branch of Stylodonts, and they have maintained their original characteristics and survived to this day. They are living fossils that reflect early mammals.
animal tags： monotremes platypus echidna
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