Monotremes (order Monotremata) are the most unusual—and oldest living—branch of mammals. They blend traits typically seen in reptiles and birds with core mammalian features: they lay eggs, produce milk, and are covered in hair, yet they also retain a single cloaca (a shared opening for excretion a...
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;...
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