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We learn early on in school that what one of the distinguishing characteristics of mammals is that unlike birds, reptiles, and fish they bear live young They eggs because after fertilization, the. There are exceptions to every rule, some reptiles and fish bear live young, and some mammals lay eggs

Monotremes (/ ˈmɒnətriːmz /) are mammals of the order monotremata There are five separate species of egg laying mammal, four species of echidna and the platypus They are the only group of living mammals that lay eggs, rather than bearing live young

The extant monotreme species are the platypus and the four species of echidnas

Monotremes are typified by structural differences in their brains, jaws, digestive tracts, reproductive tracts, and other body parts, compared to the more. Why do some mammals lay eggs instead of giving birth Some mammals, like monotremes, reproduce by laying eggs instead of giving birth because they represent an ancient evolutionary stage between reptiles and modern mammals Millions of years ago, the ancestors of all mammals likely laid eggs, just like reptiles and birds do today

While most mammals eventually adapted to give birth to live. With their ancient origins, strange biology, and limited range, platypuses and echidnas are natural marvels. Monotremes are the only type of mammal which can lay eggs

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