On the planet there are a large number of animals (including us) that have two dominant classes whatever the case for example if they are birds, incest, fish, amphibians and reptiles (Crocodile) and in the class of mammals we can find the rest unnamed including humans. It should be noted that among mammals there are only two oviparous that are mammals but lay their young by eggs.
That said, what is a mammal animal?
Mammals (Mammalia) are a class of homeothermal (warm-blooded) amnion vertebrates that have milk-producing mammary glands to feed their young. Most are viviparous (with the notable exception of monotremes: platypus and echidnas).
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Well it is already clear, a mammal animal is here ende that can be considered to possess mammary sources and in the first months or days and this is the case to be fed by its mother for its milk.
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What is an oviparous animal?
An oviparous animal has a mode of reproduction that includes the deposit of eggs in the external environment where they complete their embryonic development before hatching. All birds are oviparous, as are most insects, fish, amphibians and reptiles. Among the mammals, only the monotremes (platypus and echidnas) are oviparous.
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As I did with the mammals here I will also give you a much clearer summary, the oviparous are developed and formed in external environments once they leave their mother, this process can take some time depending on the animal.
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